Combat Patrol is the feat in question.
Since it doesn't have any stated rules for use while riding I want advice for a good set of houserules to pose to my GM.
I would pose that it works if the rider and the mount both posses the feat. With no mounted version of the feat that I can find I would call that a fair restriction. Enough or should there be an extra feat on top to make it more fair?
I would think the maximum distance should be based on the mount regardless of how far the rider has traveled. I would also say that once the mount cannot take another AoO it can't move and the rider is "stranded" and left with regular Attacks of Opportunities if there are any left.
I think that would follow the regular mounted rules the closest.
The tricky part is in the threatened area difference due to BAB and possibly reach weapons.
The mount and rider will end up with different threated areas.
Would the mount be able to move so the rider can strike when only the rider threatens?
Would the mount be able to move so the rider can strike if it stays within it's own Combat Patrol range even if it can't attack?
Moving within the mounts threatened area at least is something I hope to be able to though it might be stretching it without an extra feat cost or other restriction.
What restrictions and costs would make a good ruleset to pose to my GM and in case it still gets a no, what are the options for a similar effect; large area control/denial?