This is a Chisel plugin that allows you to set the permutation field of polygons, which specifies what certain poly types do. The possibilities are limited only by your imagination.
Building a map, and reailze you need to add another polygon to the side of an already-filled poly? Dang, you have to delete that filled one and rebuild it... WAIT! This Chisel plugin allows you to split that FILLED poly line! Way cool.
A Chisel plugin that allows you to auto-create staircases (finally reproducing the Script effect of Phforte 1.x!). Straightforward, simple - it does one thing, it does it right. Check the readme for minor caveats (mostly common-sense stuff).
A Chisel plugin that lets you swap any pair of polygons - very useful for bringing high-numbered polys down to the beginning, to make them easier to reach in the teleporter menu, for example.
