A whitelist with similar filter support to JEI's blacklisting. Would allow players to filter it to only zoom specific blocks/items. Use examples for this are a whitelist for mod id chisel, and a whitelist for all Project:Red circuits.

There is a hotkey you can use that makes the zoom feature active when you're holding the key down.
I think it will work well for what you want.

Hah...
I was going to suggest the same thing. I downloaded just to test the configs as I was hoping I could set it to only zoom into chisel blocks for a better view and leave everything else alone. That's alright though... I am OK with a no =)