I don't think this is really useful for SEO anyway.
The only difference between the URLs is `?q=` and `/` so that won't make a difference.
Searches aren't linked anywhere so the pages aren't getting indexed anyway, unless you create some links to them.
Even if you have those pages indexed by a search engine, they are just yet another view of content you already have with the question list, tags, categories, etc. They will likely be counted as duplicate content and ignored.