Suggestion and Mod support needing

[shenjiacheng5]

• Mod name: litematic
• Mod version: [e.g. 0.19.0 for 1.21]

I try to use litematic with handler,but find it is not support with litematic.
And also No single Handler-Keyboard Hotbar binds function.
Please Expand Mod support or add a new function with Handler-keyboard Hotbar that can work without delieberatly code