Is it possible to dynamically set options like vsync, hardware, or framerate?

[David Granado]

I'm trying to create an "options" screen and can set these options that are normally set in the xml.  I can toggle "fullscreen" off of FlxG.  However, I can't figure out how to set anything else (as the title suggest, I'm primarily aiming to be able to change vsync, hardware, and framerate).

Are these adjustable at runtime?