=> :?: :!: The Global->Skin Install page only lists the first 20 installed skins (in alphabetical order), regardless of how many skins are actually installed.
There is no limit in another place in the system.
It would be a fair idea to just remove whatever is limiting the results and allow all of the skins to be listed (eg. remove LIMIT or something like it from the SQL query, I imagine). That is how it is done everywhere else anyway and works fine everywhere else.