Thanks so much for the support! I converted the map to Boom standard since I was aiming for it to be boom compatible (for some reason I thought vanilla would be UDMF format, but I guess that's not available yet?). I eventually found the generalized types window but had some trouble locating it in the browser menu. I was thinking it might be a good idea to have a button in the line types menu to bring it up when people can't find what they're looking for in the defaults. Anyway it worked like a charm....
Is it be possible to add special actions that aren't in the line types menu? I want to make one that lowers a sector when you shoot a linedef (should read as G1 Floor Down LEF /fast) but that doesn't seem to be listed as one of the 141 default options.