the intersection function don't exist also with the Transform/Scale function... but with the "helpers line" that make the trick ;)
(exist with the Rotation function)

SketchBook designer has some interesting curve editing features.
I especially like the combine curves as seen in the video at 1:10,

http://www.youtube.com/user/SketchBookPro#p/search/0/AVr9wBFf3OY

A kind of blend with adjustable trimming widgets.

Something along these lines in moi would be cool!

Marc