Ah, ok, that makes sense why you're wary of the problem.
Those problems have been worked out in OACS4.5+. AFAIK, you needn't worry about the permissioning system bogging down due to too many objects.
In addition, the work we're doing on integrating WebDAV with the OpenACS heavily leverages the CR. It sounds like you might want to take advantage of that functionality.
As far as your particular questions regarding scalability of the photo album, I'm not the one that can answer you...
talli
