long time since my last post
well, let's start by new plugin, zManipulator
3 in 1: you can Move, Rotate & Scale your object with the same tool.
you can also, move the object axis to a vertex, by holding Ctrl and Left Mouse click.
to center the axis again, just hold Ctrl, and click in an empty space.
it's a beta version, and contains some bugs.
of course, i'm still working on it ^^
>> Download zManipulator v1.0b
hope you'll find it useful!