Ok this is the MINIMAL as it can be:
It looks the version under the mouse,now does not matter if item is muted unmuted,version under the cursor will go to comp
+Comp is now auto focused when creating (for previewing)
but this one ALSO has a little clumsiness which cannot be avoided:
mouse cursor must not leave version you want... or else it will comp the last version under the cursor. So for example while you do time selection little faster and mouse ends up version up or down that one will be comped.
Speed aside my still favorite one is the most simplest one (previous one). Select version you want make selection it comps, me happy. So this behavior will be an option because its not quite "SAFE" since if your mouse can end up on version you did not want to comp...
edit: And NOW when I wrote all this down I have a idea to MAYBE fix this issue ...