It's a very old observation, that Homo sapiens was made to hunt and gather on the savanna, rather than work in an office. Civilization and its discontents...

I'm wondering if you don't necessarily need to modify the human brain in order to make this problem at least a bit better. There are already some jobs that are much closer to "savanna" than "office." I chose to go into nursing because, among other things, I knew about my father's experience working in a cubicle and I never wanted that. Nursing is both intellectually stimulating (very much so in critical care/ICU, which is where I'm currently doing my final clinical rotation), and also "sensual" in the way you describe. I get a huge amount of satisfaction from manipulation physical materials and supplies–mixing drugs, priming IV tubing, changing dressings, etc. It's fun. And then there's the direct human contact, which is kind of exhausting for an introvert like me, but also really, really rewarding.

I'm guessing that jobs like electrician, plumber, etc, are probably similar in having both intellectually and sensorially stimulating aspects. Manual labor or construction leans more towards the sensory, engineering/science towards the intellectual (although some scientists get to play with cool equipment, samples, etc), math and programming are almost solely intellectual, and a great deal of office work seems to be neither.

There are a couple of questions this brings up for me. 1) Can "boring" jobs be made more sensual? I wonder how much of a difference it would make if offices were more colourful, contained obstacle courses, involved walking around more, etc? It sounds silly and even like a waste of time, but if it keeps employees engaged, it might save time. 2) Do boring jobs really need to be done by humans? I'm not talking about jobs like math and programming, which aren't 'boring', just unilaterally intellectual. 3) Can strongly intellectual jobs be reformatted in a more physical way? For example, in the future, could programmers and mathematicians manipulate symbols in the air, like Tony Stark does in Iron Man? This would at least activate significantly more visual cortex than symbols on a screen. And all of these options seem significantly more achievable, with current technology, than trying to change the human brain.