Currently there is no way to give priority to a file based on size or auto sort based on a custom order (items added into the queue follow the sort order of the file listing), while this sounds like a novel idea I am not sure how practical it would be.
You can skip or transfer a set of file/folder masks using the selective transfer rules feature.
This is a rather obscure feature that is often overlooked and is somewhat difficult to explain.
Awhile back I attempted to make a diagram of how this feature can be used, though I am not sure if it makes much sense?