this is request for very specific feature and I
understand that, however I found that there are some
very good old flying/cosmic sim games that doesn't user
to swap mouse axis behavior or they have wrong one as
default, which can't be changed. Therefore the ability
to invert X or Y mouse axis will help, but this would
need some hotkey at all, cause most of program/games
have menus- where normal mouse axis logic is desired.