Since the pbase compression algorithm is bloody awful, espeically if the photo is just over the limit on a size, I'd like control over what sizes the viewer has an option to select (in particular I'd like to present only original sizes). When the viewer comes into a gallery the size presented is not well determined, and they may not be viewing the images at their optimal resolution because of automatic compression. I have seen many comments in other forums on topics like "pbase pictures seem softwer, are they automatically compressing uploaded photos" etc.
I think the ability of the photographer to determine how their work is displayed, especially quality-wise, is an essential function for a photo sharing site.
Gene