Ok, So I have 3 questions:
(I AM USING A .PK3 INSTEAD OF A WAD)
1. In DOOMBUILDER 2 is it possible to change the speed the walls scroll without ACS?
2. Using decorate, How do I make a drivable train in ZDOOM, Making it work like one of the vehicles in Sargent MKIV's vehicle pack. Further more would I need to make tracks in decorate, and how would I make curved tracks and sloped ones
3. If Doom's code falls under the GNU license, Would that make the code public domain? And if I make a game using it, Am I allowed to sell it commercially or would I have to pay royalties to ID software or Bethesda.