Hawkeye

I would like to know if its possible to have a button switch between 2 different abilities. I have created a ranger summon ability for Faramir, and a knight summon ablility for Faramir. I have the abilities such that Rangers can only be summoned when Faramir is not mounted, and knights can only be summoned when he is mounted.

Is there a way to make one button act as the two, so that when he is on horseback, pressing it summons cavalry, and when he is on foot, it summons rangers?

If this is possible, is it also possible to have the button image as a ranger when he is on foot, and as a knight when he is mounted?

First I'll apologise for this sounding so vague.
I've been playing around with my new faction, and everything was working perfectly, but i decided to change the heros around a bit. I changed some INIs (this is where it becomes vague) but I'm not sure which ones...
Now, on skirmish mode, Rohan and Gondor can't buy heros at the citadel, and neither can my Elven faction. The evil teams can buy heros as normal, just not good teams. I've undone everything I can think that I changed but I can't fix the problem.
Does anyone have any ideas how to fix this?

NOTE
I also attempted to add a new spellbook spell to summon Rohirrim Archers, but stopped the idea and I think I deleted all the things i added for this. I think i undid everything, but I may not have.

Hmm, I can't get this method to work. What exactly do i need to do?
I've tried this method, removing the english file from the bfme folder. I've tried it without removing it. When i removed the English big, the game wouldn't load, saying that there was no English file detected. When I didn't remove the English file, the game stayed on the loading screen without doing anything for about 20 minutes, at which point I closed the game.
I reckon I've done something wrong, so can you help me? It would certainly be easier than editing that bloody csf file

Sorry if this has been asked before, but i haven't seen it. Is there a way to alter the population caps for the campaign mode, and how to change how many command points a mission gives you (Eg. Rohan gives +20 command points for the good team, I believe).