Before I go get a nightly snooze, here's a weapon I done as a "Gravity Gun" that utilised Strife's Grappling Hook and Hexen's Blast Disc to push/pull enemies, only I couldn't get the damn thing to work as I wanted it to work, so here are it's graphics.
Contains pickups and 2 flashes (per pushing/pulling stuff. Obvious)
Yep, the Lore master used it. It's not a quake-styled grappling hook. It pulled stuff toward you.
To achieve a 'puller' type of weapon I think all items and decors would have to have the "Canpass" flag, meaning they'd be movable. But I'm not messing with that anyway.