Well these templates do take time and it's mostly a hobby for me, but rest assured I do update them from time to time. Recently I completely reworked my pinball template for Game Maker and its now something I'm very proud of. This Classic FPS Engine will get the same treatment for sure!
If I do find the time and energy, I would like to add working free-aim, actual jumping, elevation,... And maybe but this is a stretch, custom wall shapes and sizes with non-tiled textures (which would make it a lot more like Doom or Duke Nukem than "just" Wolfenstein 3D).
Definitely a project of mine that is "in progress" sporadically, but when and how I will update it, I can't predict that.
Thanks for the support by the way, it means a lot :)