I'd like to be able to move objects and snap the center axis to a guideline and be able to move it via a slider control. This would be similar to manipulating a blend profile but I am only interested in a one step blend and not the beginning or end objects at all. This would make moving objects for animation much easier.

I'd also like to be able to lock the center axis. Sometimes I accidentally drag it off the object. Other times I drag it on purpose but it resets itself to center. The only way to remember where put it is to put down a couple guidelines.