Not familiar with masking in SL. I assume it's a typical gray scale/bw alpha though. SL uses layers looks like for materials. Probably just export out a uv template, import in to an image editor, and create your masks. How those masks might be applied in SL is your call. Creating the masks themselves shouldn't be too difficult, maybe you could invert the AO map and do a bit of erasing/fading and apply that as your mask? Just conjecture for conversations sake of course. Maybe an in app procedural inversion of your effects with some kind of strength falloffs is possible as a mask? Seems like something that would be accounted for pretty up front with a tool like SL.

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