Thanks for your suggestion Thierry.
I will try and see.
I sometimes need to "insert any number of vertices at equal distance between the origin and the extremity" of an edge (I've taken that sentence from your webpage - how lazy can I be sometimes
).
AC3D's "insert vertice" native function is ok but if you keep inserting vertices along an edge, you have 1 then 3 then 7 ... vertices inserted - What if I only need 6 vertices at equal distance from each others and from the origin and the extremity ?
I was in need of that, for example, for my bus front grill.
And I've used a mesh and used it as a knife.
It's much more time consuming.