"Versions" in LimeLM mean "major versions that you want to activate separately". They don't mean "every point release that customers will be getting for free".
Just name the version in LimeLM something like "2.x" and then use that same TurboActivate.dat / GUID / and product keys generated for every customer that buys that versions 2.x of your app. Even customers that update your app will still be activated.
Does tat make sense?