I do not use the forums and I was against their creation in the first place. Between the 2 MLs, IRC channel, feature and bug trackers, and the wiki, I do not see the point or have the time to bother with another communication channel.
Anyways, you are asking to support a form of fall-back when a plugin isn't available. You are best off looking at mmp.cpp to begin with. The rest of the serialization code is spread across LMMS's model classes in saveSettings/loadSettings functions.