Not sure how it would work if you have a TV or multiple displays connected, it might not support outputting over 60Hz to a TV (since I think TVs only go above 60hz for active 3D, many of the ones that advertise that they are 120 or 240hz actually only accept a 60hz signal and internally up-convert it to 120 or 240) or it might lock all the displays to a refresh rate that all of them can do.
Glad to hear about the V-Sync toggle being added. While obviously fixing the issue would be preferred, I admit that is harder to do (especially if you don't have a similar display to test) and could be a lot of work depending on how much of the game is tied to the refresh. If getting it to work with v-sync is too much of an issue, is it possible to somehow have the game detect if the display is above 60hz and default the v-sync to off if it is?