Thinking about it, i might make more sense to have build in modding loading support(that is official), it should not be hard to implement, or take very long to do.
The advantage is that modders will have no reason to try, inject stuff into it, and if thay add the mod using official means the bug reporting, can easily reflect that there are mods installed, and state so in the bug report, and it would permit steve to have more control over what mods do in the game. This way there is no need to mess with decompiling/deobfuscation/crack/etc the official game.