It's been considered, as stated numerous times by several GMs & developers, but it's silly to start thinking about it right now because we're like half-way through Velious. Custom content is a thing that they
might start thinking about long after the final Velious patch goes in, and the Velious timeline might stretch on for another couple years. A recycle/green/classic TLP server and the Discord server are higher on the priorities list than custom content, and those will be huge undertakings in and of themselves. So there have been no guarantees - it's just a consideration. And I mean, let's be realistic; nilbog & co. have a hard time just keeping up with all the bugs and petitions and update patches and events, etc., etc. - the server is perpetually understaffed, and that's probably not going to change.
There are plenty of threads where you can wax futuristic about potential P99 custom content:
http://www.project1999.com/forums/sh...d.php?t=252566