I've had an Iron Man Challenge idea for GW2 for the past couple of days. The gist of it is to play the game start to finish(core -> LW1[as of me typing this Fire and ice then watch the summery] -> LW2 etc.) No glider until HoT, no mounts untill roughly the respective chapter/map in PoF(similarly with the skyscale and turtle).
Now, as for the mounts it's easy to disable them via unbinding them and later on rebinding them once the respective chapter/area is met. The suggestion I have is either adding a key bind for the glider or a "Disable Gliders" in the general section. Just to make it so that one doesn't, out of habit 'accidentally' open their glider while falling from a high place.