So while I was messing around on a map I'am building I decided to make a couple weapons float for a little added effect (like sticking them to walls or placing them just above a grav lift), and found out that if a weapon is fixed or phased you can actually stand on the weapon! this could become a intriguing idea for jump maps or for secret staircases. I'm posting this because i haven't seen anything else related to this.
you can pick them up but empty weapons or if you decide to switch weapons the model lasts to the end of its respawn time so it can form a "temporary bridge" another intriguing idea i just found out.