Hi
in order to use the HotKey feature first you need to have some presets that can be executed regardless where you are or what you have selected in FMRTE since these presets have all the information necessary to be executed.
This means that you define the ID of the object you wan to affect directly in the preset, to do this all that is necessary is to fill the "Object ID" field in the preset manager with the id's of the players you which to affect separated by commas something like this: 316640,4587854,546125 this way the preset will only affect those 3 players. (also fill the target type in this case Player)
Now you can define one HotKey so you can execute that particular preset without leaving FM or switch windows to FMRTE and to do so go to settings HotKeys and assign one Key to the preset you have just created.
Cheers