> So in this case the script can't alert? And say "Auto-intersection
> will be arrive: are you sure to make it" Y / N

Unfortunately it takes quite a lot of slow calculations to determine if there will be a self-intersection or not.

So it is difficult to make something like that work nicely.

In a certain sense it would kind of penalize the simple and clean situations since those would take longer to process but then for no gain in those cases...

- Michael