It could also be used on its own, for charge tactics to give the flank commanders traits like brave, or in things like the Warhammer Mod to drive increased combat duels. Really the options are limitless.
A couple of further options would be checks to see if the tactic is valid for that commander, though that might be resource intensive. Another one would be the check the combat phase you are in, and perhaps a command to directly alter the phase, though that can be done via tactics I suppose.
EDIT*
Actually on further reflection, a conditional to check combat phase, and having the tactic command either forcing the phase change or having a seperate command to do so would be next to essential I think with most proper applications of triggering a tactic directly from an event. Just thinking of for instance a general self event chain, where you can influence combat on a flank directly by choosing a tactic or a phase, and without the ability to for instance check your current combat phase and let that be the modifier for what options are available for the event your are likely to need to do a substantial amount of coding to work around any potential errors it will throw up.