I have been mulling this over for a while, and think it would be an interesting new aspect of Capture Point maps if the points would have defenses. The marker balloon could have guns added (easiest idea?) or there could be a pair of guard drones (retextured and rearmed target dummies) that circle the point and fire on anyone that does not own the point. This would be everyone at first. Once you cap the point, the defenses then become yours.
Not sure if the guards drones/main balloon would be active only when the point was active, or all the time. This would make camping the next point a little more interesting, as you could not claim it, and they would keep attacking you.
Interesting options for rearming:
Grenade mines. Like regular mines, only smaller and less powerful. (shatter/impact)
Tommy gun. Slower firing Gatling with fewer rounds. (piercing/shatter)
Bull Pug. Mini Minotaur with flechette instead of shatter. (impact/flechette)
Styx. Reduced power Hades with no arming time. (Fire/fire)
Two random guns on each balloon/guard. All guns would have 90 deg arcs horizontal, and 60 deg vertical.