To do this your best bet is to talk to large numbers of biomedical engineering alumni. As a data point, you mentioned before that SFU has one of the most respectable biomed engineering programs. As another data point, University of Toronto doesn't allow general stream undergraduate engineers to choose certain specialties requiring that extra bit of intellectual horsepower unless you are able to enter (and survive) the more theoretical Engineering Science program. Biomed Engineering is one of the specialties that falls in this category.
I feel the reason that most biomed engineers don't pursue CS-ish careers is because many of them feel that their additional knowledge, training and suffering should be used for more "important" pursuits (grad school, designing life-saving medical devices, etc.). Combined with the general engineering school attitude that their education is more rigorous or harder than probably any other major in university (other than perhaps actuarial), and you have a situation where most engineers freshly graduated (barring Computer Engineers) would view pursuing a CS-ish career as a major step back.
However, given your stated interest in other goals (e.g. cognitive science, human cybernetics/enhancements/augmentation), this may not be a bad path to take provided you are mindful of and can navigate the immediate post-graduation job interviews.
As others suggested in this thread, it seems that you're probably much more geared towards a startup culture, in which case if you've chosen your electives correctly in 3rd and 4th year you would hopefully have had the chance to focus in on data visualization and/or bioinformatics and show an impressive body of work.
If you are motivated enough you may also try to take CS & math courses in the summer, or work on design projects to build up a body of work. Ideally summers would also be taken up with internships also, but at least the studying intensity would be somewhat reduced to allow you to get ahead on other credits/courses/knowledge/portfolio.
I wrote this post up and circulated it among my rationalist friends. I've copied it verbatim. I figure the more rationally inclined people that can critique my plan the better.
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TL;DR:
* I'm going to commit to biomedical engineering for a very specific set of reasons related to career flexibility and intrinsic interest.
* I still want to have computer science and design arts skills, but biomedical engineering seems like a better university investment.
* I would like to have my cake and eat it too by doing biomedical engineering, while practicing computer science and design on the side.
* There are potential tradeoffs, weaknesses and assumptions in this decision that are relevant and possibly critical. This includes time management, ease of learning, development of problem solving solving abilities and working conditions.
I am posting this here because everyone is pretty clever and likes decisions. I am looking for feedback on my reasoning and the facts in my assumptions so that I can do what's best. This was me mostly thinking out loud, and given the timeframe I'm on I couldn't learn and apply any real formal method other than just thinking it through. So it's long, but I hope that everyone can benefit by me putting this here.
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So currently I'm weighing going into biomedical engineering as my major over a major in computer science, or the [human-computer interaction/media studies/gaming/ industrial design grab bag] major, at Simon Fraser University. Other than the fact that engineering biology is so damn cool, the relevant decision factors include reasons like:
The two implications here are that even if I am still interested in computer science, which I am, and although biomedical engineering is less upwind than programming and math, it makes more sense to blow a lot of money on a more specialized education to get domain knowledge while doing computer science on the side, than to spend money on an option whose potential cost is so low because of self study. This conjecture, and the assumptions therein, is critical to my strategy.
So the best option combination that I figure that I should take is this:
Tradeoffs exist, of course. These are a few that I can think of:
There is still the issue of assuring more-than-dilettante expertise in computer science and design stuff (see Expert Beginner syndrome: http://www.daedtech.com/how-developers-stop-learning-rise-of-the-expert-beginner). I am semi-confident in my ability to network myself into mentorships with members of faculty [at SFU] that are not my own, and if I'm not good at it now I still believe that it's possible. In addition, my dad has recently become a software consultant and is willing to apprentice me, giving a direct education about software engineering (although not necessarily a good one, at least it's somewhat real).
There are potential weaknesses in my analysis and strategy.
So for this "have cake and eat it to" plan to work there are a larger string of case exceptions in the biomedical option than the computing options, and definitely the media and design option. The reward would be that the larger amount of domain specific knowledge in a field that has held my curiosity for several years now, while hitting on. I would also be playing to one of SFU's comparative advantages: the quality of the biomedical faculty here is high relative to other institutions if the exceptions hold, and potentially the relative quality of the computer science and design faculties as well. (This could be an argument for switching institutions if those two skillsets are a "better fit". However, my intuition is that the cost for such is very high and probably wouldn't be worth it.)
Possible points of investigation:
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Thoughts, anyone?