Addon name: Shouldn't it be called ExtrudePush

[KarlZeilhofer]

Just a thought.

You can pull something out, and push something in.
Perhaps it's early enough, to change the addon's name.

[capnm]

Good point. Howard in the Blender Foundation is working to fix the Boolean modifier, especially in the coplanar case https://developer.blender.org/diffusion/B/history/newboolean/
So I wait until it's merged into v2.81. Then I'll probably rewrite it in a new github repo.