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don't limit your toolset to polys for high poly modeling.it's worth learning NURBS and surfaces in Maya for mechanical objects especially.
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Couldn't agree more. I just lost a job because of lack of nurbs experience. Still, it wasn't realtime stuff. My own dumb fault for not having touched nurbs in about 5 years I suppose.
But anyway, what is it you're specifically looking for? On the poly side, a friend just showed me this script which is pretty nice: http://www.highend3d.com/maya/downlo...ools/3304.html
Beyond that, hard to know how to help you in terms of mel scripts without explanation of what it is that you can't currently do without scripts. All the old useful stuff from the likes of mjpolytools etc is pretty much in maya 7.0 now.