https://bugs.winehq.org/show_bug.cgi?id=44942
--- Comment #1 from Rosanne DiMesio dimesio@earthlink.net --- The checkbox was disabled because official WineHQ staging releases stopped. While work has unofficially been done on bringing staging up to date, there are still no staging packages on dl.winehq.org, nor have I seen any official acknowledgment of Alistair as the WineHQ staging maintainer. If and when that happens, I will send a patch to re-enable the checkbox.
As to what the holdup is, that's a question I'd like an answer to myself.
(In reply to Aaron Franke from comment #0)
So what am I supposed to do, reject these test results?
Yes. At present, users should submit test results for the development release, and if wine-staging solves any problems, mention that in the Extra comments section.