I use to use Game-editor a few years back and they had a great Path tool. All you did was click on the Path tool, let it know what sprite will follow it and then click on two points, one for the beginning and one for the end, you could end up going back and manipulating the line by adding or subtracting points and adjusting how you like...
I would love to see that in this engine.
Here is the link.
http://game-editor.com/forum/viewtopic. ... ath#p81184
Just thought about this because I am trying to do an intro for my game and I am having the main bad guy swoop down onto this ledge in an arc motion. Having a tool like what I mentioned above would make it easy and there are other ways to use that tool as well of course.
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There is spline plugin in the 3rd party plugins. You should check that outl.