I stumbled upon this by accident while testing one of my Dominion maps. You can set any object to a capture point usable in Dominion by simply giving it the label "dom_base". Everything from vehicles to weapons can be set as capture points! This could be used to create a moving capture point using vehicles, or theoretically set a person as a capture point by making a weapon or armor ability a capture point, since the option to pick something up or get in a vehicle overrides the ability to capture.