When using Mousetrap's profile, I found the following issue with layer modifier keys...
Ctrl = layer2
Alt = layer 3
CTRL+ALT+DEL (SAS screen) -> Cancel -> press ctrl or alt and it sticks on that layer, does not release it (untill pressing the other layer modifier key)
https://forums.highrez.co.uk/viewtopic.php?p=26607#p26607