this mean sending gameskin to server and then to each client. It would raise huge security concern. What if a troll uses sexual gameskin or gores one? So it's most likely not happening
but if u have high refresh rate monitor it can happen that these resolutions wont work with full hertz, except they just emulate the resolution, instead of changing it on the monitor too
its not that win7 sucks, it's that SDL and other libs will support it less and less, and so its better to also drop support, bcs gets too complex to test everything everywhere^^