I would like to humbly suggest some kind of profiles to be saved for Call for fire. Like 4-5 various settings which could be easily accessed. It shouldn't be necessarily saved for all games, it may be saved on start of every game if it would be problematic to do.
Reason is to help FSS players, and also ppl die in this game mostly bcs of typing

So fast switching between modes/profiles would help a lot. While mode would be switched, there could be small message with all settings just to be sure (similar to what "-s" does in game).
Also i like -cff mode to switch angles, but for what it does, could it be (possibility to make switch it to) 10x smaller size and moved to side? That way it could stay all time on screen without need to hide it.
Also since there are given values for max and min numbers (shells, delay etc) maybe its possible to move settings from keyboard input to something visual - adding picture of rough idea.
One last thing in the end. After launching cff or railgun, would it be possible to see some mini countdown? This would help a ton for others classes with call for fire as well. Can imagine its possible in real life, count when shell will land from calling for it. Running blind on the other hand causing deadly moments and wasted shells. If this countdown would be visible for team, it may actually cause some teamplays around CFF, kiting for FSS without need doing it himself and more.