hmm, well, if I can offer some ideas.
Assuming that the tool-tips themselves are not something hard-coded into unity and something you can alter for Playmaker, maybe having in the preferences a spot where you can toggle them on and off and also adding in a spot where you can have a "click to reveal" and/or a "reveal tip when held over spot for X seconds" kinda thing?
I have no clue if this is do-able or how hard/easy it'd be but I (personally) would certainly like something like this. that said, i'd definately consider this one of those little things so i'd not want to ask for it to be done asap if there are other issues that need to be addressed.