Well, I am the one that made XML and scripting support for those projects and still do, so "developers" like you can make additions. As mentioned above, my projects are alive and kicking, you fixing anything does not mean my project was inactive in that time. It is your prerogative to "sell" "your work", but the mentality that you, questionably, fixed everything while we where inactive is demeaning for the very same project you used.
And since you want to go this way...
I propose to anyone reading this to just subscribe to L2jMobius and pay for anything extra he needs on that "vendor fair" section. It will cost you way less and you will have access to daily updates for all projects. If you do not feel familiar changing XMLs make everyone (developer and player alike) the favor to not open a server.
Working on multiple versions of the game is a strength, not a weakness.