I would like to make a proposal about the curent nodes set location, rotation ans scale.
Currently there are used to set a specific location or rotation... but to animate a transition between two step, it is required to use others nodes and it can sometimes be hard and time waisting.
My proposal is to add new interpolation nodes (that can maby be used in other nodes in the future) and modify the current set location node for example (by default set interpolation to none to act as it does right now, but if the interpolation is set to something like linear in my example, the cube will move during one second (define with falloff width) from its current location to the location set.
(same with rotation and location)
If the interpolation is set to another thing like sinuosidal, then the user can set the ease in and out.
If the intrerpolation is set to bounce, then new values like number of bounce and size are added for controling the animation.
I think an image explain more than 100 words :

In this bad photoshoped image, you can see all interpolation mode (colors are not right beceause screenshoot from animation node)
Logic Tween for Move, Scale and Rotate:
Most helpful comment
Logic Tween for Move, Scale and Rotate:
http://www.dzynek.pl/images/tween/tween.png
Download and instruction: