Hi PenguinTD,
(Not entirely sure I understand what you meant but…)
I’m not suggesting the UseMouseForTouch was setting itself. I’m saying at some point in my learning and creating this project (first project) and trying to work out how to get mouse events (for about 4 weeks!) I’ve most likely clicked it, completely unaware of what it does, probably thinking that by clicking that option it will make things work on touch devices later as well. So as it stands I still don’t understand why it stops mouse click from firing, and I’ve not seen anyone suggest this being clicked is a reason for onclick not working. If that is expected behaviour, all well and good, pleading ignorance at this stage. 
So I can’t file a bug unless I understand what the correct behaviour is.
Cheers,
Max