You can change health, look around in there!
(1) Not without a Template.
(2) There is an item called Gold_001 in your current inventory, which is actually under NPCs Altered / Killed by player (NPCC), under NPCC PlayerSaveGame. Change the quantity of this to anything up to 4.2 billion, roughly (it is an integer value). You can also, if you wanted, manually add NPCO records to this section, and spawn items for yourself like a full suit of Daedric armor, for example

. If you are running the GOTY edition, and it doesn't like the order your inventory's in, it will just correct itself usually by reordering the section that was messed up.
(3) If by support files you mean Mods for morrowind, Grifter66 has quite a few guides on this around this forum