First of all, I couldn't figure out how to actually remove a package from Monticello. Unloading it simply emptied it but it would still show up in the list. Would be nice to have that.

Now to the actual problem: suppose I have a package named 'FooBar'. Now I want to rename that package to 'Foobar'. I encountered the following things while trying to do this:

creating a new package 'Foobar' does nothing. The old package stays in the list but I get no notification about what went wrong.
trying to load the old package with the new name from Sqeuaksource through Gofer fails: Gofer new squeaksource: 'TheFoo'; package: 'Foobar'. I think this is the correct behaviour.
creating a new package named 'Foobar' in a fresh image (so that the old package is not loaded in Monticello) and trying to save it to Squeaksource results in a notification telling me that the package I want to create already exists (it's messing it up with the old package).