I guess I know what you mean and I have been thinking about something like that for some time. Unfortunately, it is not easy to precisely define how exactly should such a tool work, the details are important. If you could give more examples of how you would expect it to behave, it would help.
Pen Tool
Possible Addition?
I was wondering if you guys could create a new tool with a new version of RealWorldPaint.COM, the pen tool! I would love to have this function as it really helps with creating quick straight lines and natural curves, I would totally pay money for this!