Complex masks

I'm making an animation and lets say the attached image is the client's logo.

There are 2 pictures of a mountain. I want to pop a ton of the logos over mountain pic1, in order to reveal mountain pic 2.

Here are my questions

1) I want the mask to be in the shape of the logo and on one layer (like combining paths in Illustrator). I don't want to deal with 2 layers per logo if possible

2) I want to be able to easily select these mask, yet when I click on the mask in the single pane view, I always select the image behind the mask, not the mask layer.

3) Is there a way that I can make something like a particle emitter for a mask, like something that "sprays" logo masks all over the mountain pic?

4) I'm trying to make my mask with bezier curves, is there a way to make a mask using a .png?

I know you can click on the mask layer in the timeline and in the layers section, that's too slow, and I'd like to avoid it if I can.

I there a way to make the image locked or unable to be selected, yet still be able to drag the mask around?

Thanks!

Can be done in Motion, I doubt in FCP X directly, but I'd be inclined to think Motion could do this easily. Wondering if I'd try this as an FCPX Effect or an FCPX Generator...

Could you point me in the direction to a tutorials thats details the process for making in in Motion? I'm not using Final Cut.