finally managed to upload a new version of simplexbmcremote to extras-devel. the upload failed for 0.8.3 and 0.8.4 due to a missing build dependency. now that's fixed and you should be able to retrieve it via the extras-devel repo.
the code for the 0.8.4 from extras-devel is actually tagged with 0.8.4-1 in the git repo. the 0.8.4 tag was done before trying to upload the first time to extras-devel. i'll try to be more consistent next time and tag the git only after successfully uploading in extras-devel.