I came across a situation where I needed to "snap" at the inflection point of a curve, where the second derivative changes sign if I'm not mistaking, maybe this could be useful to others as well.
Hi Felix, right now there isn't any built in snap for that, but I have an idea of adding various methods for calculating points on curves that would be exposed in an extended properties dialog. So that could be one of them that can be added there when I get a chance to work on that dialog.
By the way, recently, I've seen a tutorial using Rhino and WOW! This made me realise why I've choosen MOI, it's way ahead in terms of ease of use and simplicity.