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When a solution is opened, look for a .vssettings file of the same name next to the .sln file. If it exists, load those settings. This would allow devs to check in .vssettings files to source control along with their solution and have it automatically applied. Useful for open source projects.
Consider security. I'm not sure whether .vssettings files could be harmful any more than loading a foreign solution, but perhaps it would be best to disable this feature by default.
Consider ignoring the associated settings file with the solution (saved in the .suo) or perhaps make this behavior optional and allow users to choose which has precedence.