These are the current Gallery parameters

Who can create: Gold, Top Leaders+

Albums - allows creation of folders to contain uploads.
Media - enables uploads of following:
Photos max 6.1MB, auto-rescale with user interaction
Videos max 20MB
Files ext's: zip,rar,doc,pdf,txt,xls,xlsx,ppt , max 10MB
Music max 10MB

All the extensions allowed by media upload page:
zip,rar,doc,pdf,txt,xls,xlsx,ppt,jpg,jpeg,gif,png,mp4,ogv,ogg,webm,m4v,mp3,oga,weba,wav,m4a

Seems like some descriptive help is needed on that page. Tooltip? Text?