1) No, only when slain
2) Correct it includes the base level bonus for the points you invest
3) It hits a large number of times per attack
4) No, only a crafted one
5) There shouldn't be any such synergies
6) Because player damage and monster life were reduced in version 1.0 to forever fix all damage cap issues, changelog for more info
7) You can level above 120, those levels require exponentially more experience. Kabraxis Stones require level 121
8) You can use d2stats I believe, or plugy. Everything found on terror after a4 sanctuary is max ilvl
9) If it has that modifier in the affix pool. For example rare jewels can roll 3 to 10mf, crafting them with the Tir rune recipe means it can roll 6-20.