Currently since there is no PlayerBrushEvent (which should be added), we're having to use the PlayerInteractEvent.

If a player begins to start "brushing" (holding right click with a brush in hand) the PlayerInteractEvent only fires one time, and not each time the player attempts to brush. This causes issues where we have no way to fully detect when a player is trying to brush a block.

Example:
If I'm attempting to create a land claiming plugin, and want to protect a player build. If the player is using suspicious gravel or sand in their build, there is no way to prevent another player from brushing. They can begin and start the "brushing" animation, while outside of the claim, (holding right click with a brush in hand), and continue this animation, walk into the claim then begin brushing the suspicious gravel/sand.

Here's a real example we're struggling with at GriefPrevention
https://github.com/TechFortress/GriefPrevention/pull/2162