Hades does the online stuff. A buttons file from UP would support most of the planes supported by SAS buttons without changing any stock planes FM's and without smoke bug.
Right now there are 2 small problems with the UP buttons file:
1 - it's not available for standalone download. you have to download the whole UP to get it (or ask some UP user

)
2 - the current UP1.8 buttons doesnt support the Histomod Korea pack (next one will, according to what I heard)
I have a custom buttons file that is nothing more nothing less than an UP1.8 buttons with added support for those Histomod planes but Im kind of reluctant to distribute it because I dont want to add to the mess of available buttons files... and Hades promised to add support for the Histomod planes to the buttons file that will come with the UP patch (and I guess he will add support for some more planes too), so my custom buttons file is being used to test the unofficial add-on for UP that im building but when the UP patch is released we will use the regular UP buttons.
IMO, the fewer buttons files are around, the better: if people want an SAS-like buttons file that's suitable for online, giving them the UP buttons would be a good solution because it wouldnt add any new buttons files to the currently available choice.
So the simple solution would be if Hades could make his UP buttons file available as a standalone download, and as the new UP buttons file is probably already there and ready to use (must be so, if the patch is being tested) why not make the new version available already?
It would be even cooler if the UP buttons was added to the SAS dowloads as "UP online buttons file v.x.xx (suitable for publilc DF servers)" as opposed to "SAS offline buttons file v x.xx (suitable for offline and private games only)"... but OTOH SAS is about off line, so there could be a link to the UP buttons download page at the UP website instead of a direct download...