You can do the same on using non PA maintains just after popping a PA power like eye beams or micro munitions. Hit and hold maintain just after you trigger the PA power and you get both off.
I wouldn't get too excited about vehicles until you see the actual details. I'm thinking what a lot of folks would consider "vehicles" to mean (freely being able to use powers while using the vehicle as a travel power) and what Cryptic will actually implement (99% positive this means a become critter device with specific…