Currently the only context that can be used to fetch search queries from is the String context. It would be useful to be able to choose other contexts as well. For example, I've created a context that can fetch values from the query string rather than the URL arguments, but I'm unable to select it in the "Context to fetch search query from" dropdown for a search result pane.

I'm proposing adding a configuration form to allow site administrators to select which contexts appear in the "Context to fetch search query from" dropdown, rather than hardcoding the only available context to "string".

If this would be an appropriate modification to this module, I'd be happy to discuss implementation details and/or provide a patch.