Aircraft landing restrictions?

[PeteHMB]

Searched and didn't see anything clarifying this.

I was watching the latest Beta walkthrough (thanks Hamma!) and while looking at the massive landing pads on the bio-dome, I started wondering...what if I could land a Galaxy on the roof? What if I could land one on a wall? Ramp?

I played some PS1 the other night and was rudely reminded (by having my vehicle near-instantly despawn underme) that even touching the landing gear to anywhere other than a landing pad or the ground is forbidden. Has anyone clarified how and where aircraft can land in PS2? Can light infantry jump up to the top of a wall to escape into a Galaxy Gunship coming in to rescue them? Could a light infantry land his/her Mossy/Reaver/Scythe on a roof or somewhere out of the way, jump down to hack something, then jumpjet back up to his vehicle and take off again?

Bottom line - are there going to be zones of automatic "no landing or you will be instantly (or within 5 seconds) deconstructed", or could someone say, land a Galaxy on the roof of a tower to pick someone up? SOI for bases should prevent a galaxy from deploying on a roof as a mobile spawn point but I see no issue with being able to land for repairs/loading/offloading troops.