In PW just highlight what polygon you want to be made bouncy/teleportey (haha) and keep tapping [CTRL] + E. ~30 times for a bouncy poly; 50 or more for a teleporter. MM or MM+, copy the polygon and paste it over itself.
Y'see it's basically just Soldat's collision detection system working on overload... you're touching 100 or however many polygons at the same time, so instead of just standing solidly on it, it propels you.