Script option: There is a free "SnapTo" script to... "Move currently selected object to clicked location". This can be found via a Google search for "Ockham's python". This Python script is easy to use and may be of help here.

Config possibility: As for the lights leaping far away when tweaking their dials, that sounds like the dials are way to sensitive for some reason. I'm fairly sure I recall in an old Smith Micro webinar, where the tutor showed how to ramp up or damp down the sensitivity of any Poser dial - can anyone give advice on how exactly to do that? Is it in settings, or does one hold down a key when moving the dial?

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