I’m afraid Cinema doesn’t have type of drawing tools you’re accustomed to in your CAD package. You might want to import your CAD drawings as .ai or .eps files.
About the only thing you can do is check the “regular grid” option in the extrudeNURBS caps, and set the division quite small. You might still get a few artifacts, but it should be manageable.
If you have R9 it should be on your goodies CD. You can download plugins for earlier versions on Maxon’s site. BTW, this is an AE plugin–not a Cinema plugin.
It’s possible, but it requires a plugin. Specifically, Weightlifter Pro by Arndt (moderator). I think it’s available in the Dairy Store. Highly recommended.