I think the basic idea is good.
My concern is that if we allow responses to bee too 'free form', collation and analysis of the results will be too difficult and very resource intensive. We might want to try and enforce a standard format for responses to make collation of results easier. This could be done with a basic elisp package put into ELPA (similar in principal to report-emacs-bug). The package could even have an interface for submitting new proposals. It would even be possible for the package to list currently open proposals etc.
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