Is any way to have all the thumbnails with the same size?
I saw this gallery here: http://aletapety.pl and they did it.
Regards.
fotografi
I wanted this same feature, and I have just installed the modpack by Stramm.
The support thread is HERE (http://forum.coppermine-gallery.net/index.php?topic=28367.0).
It's quite a big mod, so you need to read properly to make sure this is what you want, but it has the ability to make square thumbs.