I stay in One Mind/Exotic Nuts, as I believe is generally the best course.
However, sometimes I accidentally click Communal Brainsweep, while going for a reindeer, moving the mouse around in a Cookie Storm, or trying to hit the Golden Switch during a Click Frenzy.
I'd like it if one of these things could be implemented:
1. Have a warning dialog box pop up, as it does for One Mind, for Communal Brainsweep and Elder Pact.
2. Have an option to be able to hide upgrades that you won't want to buy. EDIT: With an option to unhide them; for instance, the Chocolate Egg, which you want to buy, but not until the end of a run.