Persistent Brushes do not persist.

What feature do you want to see added?

FAWE brushes will be stored in cache, so whenever you leave the server/the server restarts your brush will still work.
The item that you set the brush will show the brush name instead of the regular item and the settings will be in the description of it.
It gives the hability of a certain item be multiple brushes instead of being just one brush - it also secure you can save brushes into the hotbar save work in separate servers that have FAWE with this config enabled.

This is the old demo of the brush in FAWE (without the brush name and settings)
https://www.youtube.com/watch?v=31PAwOgYtm8

Are there any alternatives?

Allowing the persitent-brushes into FAWE config.

Anything else?

Actually persistent brushes don´t persistent at all as intended in the past.
I don´t know if its a bug or a feature that was removed at all. So I´m making this as feature request and as a fix request to see if it can be readed in the plugin.

https://github.com/IntellectualSites/FastAsyncWorldEdit/issues/978

Start by reviewing the persistent-brush behavior described here and the related FAWE issue 978. Determine how brushes are currently stored and restored, then verify that configured persistent brushes survive leaving the server or restarting it while retaining their name and settings.