Description:
Drawer addon - Overflow Hopper Upgrade
Instead of Voiding excess items from a Drawer it could output to the below inventory once the drawer is full.
This would allow an important machine like a reactor to always have a full buffer drawer, then you could use the below inventory for everything else. Especially for mods like avaratia that use tons of items to make singularities.

I have been looking to set up something similar so I definitely second this! I am looking to use an ender drawer to access my storage remotely however I would either end up with a drawer that is almost always empty due to having to fill a very large drawer first, or having to use two separate sets of ender drawers; one to input into the large drawer which will always be empty, and another set that will pull from the large drawer and always be full. I think this would be a great addition as it should save on resources in terms of both in the game as well as performance-wise, especially at a large scale.