Is it possible that you make a trig where u assign the 1 button on the key board to a unit group so that when u press it again you automatically select a unit, even if you hadn't previously clicked that unit and pressed ctrl+1????
The only keys that can be detected by events is the arrow keys so it is not possible. Otherwise it would be possible if you save a uniot group or a unit in a variable and then use the "Selection - Select (Last created unit group) for Player 1 (Red)" or "Selection - Select (Triggering unit) for Player 1 (Red)". (The vaules are just examples.)