Currently "allgirl.booru.org" is running Gelbooru Beta 0.1.11 and it is pretty basic, yes. The only way to improve it depends on the people that run "booru.org" (not me). All subdomains of "booru.org" (like "allgirl.booru.org") are using Gelbooru Beta 0.1.11.
At the moment, yes, only 1 person administrates this booru.