Just some of the few keyboard shortcuts in Potplayer I use regularly:
"<" and ">" to shift the subtitle sync by half a secondd "shift-<" and "shift->" to adjust the audio sync by half a second "[" and "]" to set an A-B repeat of that awesome scene or soundtrack "D" and "F" to move by a single frame forward and backward there's also shortcut to decrease and increase things like saturation and brightness by 1% or shortcuts for 0.5x, 1x, 2x size.
I have to make do with SMplayer in Linux which is awesome but you have to setup the keyboard shortcuts manually yourself.
wasd for games, ctrl+shift+qewasd for play/pause/forward/backward/next/prev and so on. Don't need to switch window, don't need to move hand away from wasd. Can't live without it now even though I don't have so much playtime any more. Works just as well in any other environment.
Even works as a portable app.