This is the task for mesh edit tools move from addons_contrib to addons release.
mesh edit tools represents years worth of code that differs from or does similar functions in a different way & also functions that are not easily solvable in either c or py.
This "collection" of functions is built towards edit mode mesh vert, edge & face tools.
Edit mode: Tools, Pen tool (modal vert draw),
Edit mode: Tools, Mesh Edit tools, sub panels, vert, edge, face, utils.
Icon only sub panel header "Fast Tools & edit mode selection tools"
Cad edge tools, extend, project, angle off edge.
2d edge fillet
Set edge length
Edges to wall
Face inset fillet
Select by index
Double right click in v/e/f or combined modes for same menus as Ctrl/v/e/f
Integration into select & edit mode specials menus
To Do, merge in Extrude/reshape by @Germano Cavalcante (mano-wii)