Well, i must say that i don't use Alt-tab very offen, so i'm not sure at all about that but :
I remember many users had problems with task switching after using the resfix ..
So i don't know if it's possible to use a workaround ..
Maybe this works only when in interface and not in 3d game .. or something.
I'm sorry, this doesn't help a lot

and i admit this make some time now that i didn't travelled into the seas with SH3 ( maybe the "summer effect" ..), so, nothing 100% sure about those troubles.