It was part of the initial design I had in mind for Ubooquity. So I might add it in the future.

It's a bug introduced in 1.7.0.
It will be fixed in the next release.

This warning ("Could not understand cookie header") is triggered by the cookies created by the Synology interface in your browser. It can be safely ignored (and I should probably remove it).

Share all you want ! The plugable theme feature has been implemented so that people can do exactly what you did. :)

Very nice theme by the way.

Ubooquity is not supposed to depend on the number of files that are scanned (at least not enough to cause memory problems).

Increasing the memory dedicated to Ubooquity is indeed an adequate workaround, although not a definitive solution (if a bug has to be found and fixed).