For 4.5 All-In-One, It sounds like we're all in agreement that we want Squeak to behave consistently across platforms out of the box, which means twiddling that 3ButtonMouse setting in the .ini file.
So, now that enough people have weighed in, I will try to do that today.
Done. I know we thought Mac should be fine without resigning but, just for sanity, if someone would with a Mac would please download the 4.5 All-In-One and verify it can launch, that'd be good.