Don't go overboard with that -- IIRC, extremely few people succeed in becoming fluent in Lojban. IOW, think twice before flouting a linguistic universal.

(it can mean "I want it to work", an 'ought' statement)

Not everyone would agree that “I want it to work” is a correct restatement of deontic modality. (The one I use when wanting to avoid the ambiguity of “should” is “it had better work”.)

This would likely also have the same effects as thinking in any foreign language.

That effect is due to the fact that you're forced to use your System 2. It probably disappears after you become too fluent in the language (for example, FWIW, I don't ‘feel’ that happening with English).

Also, +1 or ygert's suggestion to read The Language Construction Kit, and you may want to check out the resources I mentioned in my reply.