I'm a little behind on the times and I just started using the Swiss Army Gun, and it's REALLY useful and saves 2 inventory slots. But typing a command in every time you want to change mode is pretty annoying, and I don't really have room for 13 keybinds, so I suggest a GUI that automatically sends the commands "/sagmode <mode>" to the server upon use. Instead of being just a menu, perhaps it could be an image overlay and you move your mouse toward the icon in a ring; it's used in a lot of games for quick-selecting items (Legend of Zelda: Twilight Princess, for instance) and would probably work in this situation.
If fitting 13 items in a ring turns out to be hard to hit correctly, it could maybe be split into submenus of 3 categories, then a different ring with 4 or 5 options each.
For reference, here are the 13 different modes, in the order given by the SAG help menu:
1. Hammer (Destroy)
2. Wrench (Build)
3. Print (Visual)
4. Plant (Build)
5. Wand (Destroy)
6. Paint (Visual)
7. Fillcan (Visual)
8. Delete (Destroy)
9. Bomb (Destroy)
10. Printfill (Visual)
11. Nuke (Destroy)
12. Move (Build)
13. Copy (Build)
Note that these are actually 512x512 and I can make bigger versions as they're stored as vector images.
