Ways to open RPG inventory

[SoSeDiK]

My server is mostly based on survival and crafting is important part of it. Since we can no longer craft in vanilla 2x2 grid and must open custom workbench, this takes some time and is really annoying. So, here they are, ways to open RPG inventory:

1. Just like it is now (by clicking on 2x2 crafting grid), but allow to disable it in config and bring back 2x2 crafting grid.
2. Command (it is already done).
3. Special button (like others). For example, you can set an item in ninth slot and open it by: 1) left/right clicking on it in inventory; 2) pressing 9 (based on slot you made) on keyboard if your slot is in hotbar, but not when we select it by scrolling the mouse to prevent accidental opening (in this case you must right click to open RPG inventory).

These are just my suggestions. Maybe someone have other ideas?