Plugin developement and SVN

Two things to note, URL requirement when registering plugin is currently worded as:

Plugin URL (required, must be a link to a ZIP file of the working plugin)

So you can simply put packed up plugin somewhere (your server, public Dropbox folder, etc) to provide it for review. It doesn’t have to be established site or version control repository.

Second – it is highly not recommended to use WordPress org repositories for actual development, ideally you should only commit releases there.

There are number of different workflows to handle it, so it’s individual choice – do some research around. Personally I do development in Mercurial and commit only releases to SVN (without doing any integration between two, they just set up to ignore each other).