It's slightly slower, but that's about it. PSD's aren't seen as layers, they are seen flattened. Vegas does read the alpha channels if embedded though.
Thanks, I've been scanning using photoshop and the default save format is PSD. I also like to use uncompressed formats like PSD because it gives me assurance that there is no compression .
There are other, just as good, and easier formats for Vegas to handle, such as PNG and TGA. Further, higher resolutions can hurt you, not help you. The end result is going to be approximately 72dpi at the end of the day, once it's video. So, scanning extremely high, uncompressed photos only serves to slow Vegas and your editing down, not make for better video. Unless you're doing deep zooms, 1440 x 960 is plenty much enough.
Sure, but since he has photoshop, he should use actions. Better to build your skills in Photoshop if that's what you're using.
I find photoshop to be useful in Vegas because, even though Vegas flattens the image, I can go back into photoshop and make changes on a layer by layer basis.