All features that currently exist:
1. All items in the hotbar (configurable number) are sorted left-right in recent use, or right to left if you enable it in mod settings.
2. If there is already an item in the hotbar, it will move to the front and everything else will slide to fill the gap created.
2a. unless using in-place replacement, where instead it will replace the oldest item without shuffling anything.
3. If you manually remove a filter, it will fill the gap instead of moving everything.
4. Hotbar selection, any hotbar 1-10 can be assigned for the mod's use.
5. Works with items you have in your inventory, and if enabled, any cursor ghost items as well.
6. Respects the item's quality level if applicable.

It needs to be installed on the server I think, but you can disable it and enable it in the per-player mod settings.