Custom Friends Capes
All capes are added via commands and tab-completion is fully supported.
SSP is supported as well to give yourself a cape.
/cape set <url or cached texture>
/cape set <name> <url or cached texture>
/cape remove <name>
texturelist - lists cached texture names
list - lists all players who have capes via this mod
remove - removes the cape from the player
set - sets the cape to the specified url or cached texture name
When URLs are added, they are cached. The cached name is the file name minus the extension, so http://somesite.com/some_cape_file.png would be some_cape_file in it's cached version.
These cached texture names can be used in place of URLs in commands.
No need to ask for permission to include this in a mod pack or to use it on a server.
Note on Mojang EULA
So long as you are not a server owner selling access to these capes, it is perfectly acceptable to use this mod on your server as stated by the Mojand EULA.