This discussion is ridiculous a bit. I see 2nd solution as obvious way to do it. MTA was never modifing game files in order to enchance experience, and that's why everyone loves MTA. If u trying to build server based on total conversion and let your players manually install mod files you can distribute custom MTA build (with limit adjuster) aswell.
So, lets see 2nd option closer. Currently in MTA, there is no ability to add new models into game, so what is the point of limit adjuster in that case? Shouldn't this be done first?