Oh, didn't know that.
Just out of curiosity, what are they reserved for? Control groups or something like that?
CTRL is reserved for:
- force-firing
- alternate movement methods (running, strafing, turning turret)
- various indicators (ctrl+H, ctrl+M, ctrl+B, ...)
- various debug commands
ALT is reservedd for:
- facing indicator
- weapon damage range indicator
- probably something else I'm forgetting...
SHIFT is reserved for:
- alternate movement method (force-walking)
Besides Battlescape, all 3 of them are used also on Geoscape and Basescape for various things:
- SHIFT + sort = sort soldiers descending
- CTRL+sort = don't sort, just show numbers that would be used for sorting
- CTRL + ALT + X = return unused stuff from craft back to base
- CTRL+click to move a facility
- CTRL+click to move HQ
- CTRL+1 .. CTRL+9 for quick equipment
- and several more I'm forgetting...