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This is a good idea - Roadkill was originally designed using slugs the way works, which ensures you never have any SEO issues.

Roadkill is used almost entirely for private wikis though, so using more friendly urls makes sense.

Please use Github for bugs, and provide a way of reproducing it
This is currently being looked at for the next version of Roadkill, which will move to Markdown only. Suggestions for editors are welcome (please use Google Groups)
Never going to happen I'm afraid, identity doesn't support groups.