Hi, glad that you enjoy the mod!
Scaramanga wasn't in GoldenEye 64, while I see why you're suggesting him, I don't think he's needed for just a gamemode, plus we'd need character modelers for that.
The Golden Gun respawns in GE:S and not in GE64 because here it can fall on unreachable spots after the player's death, and if that happens while it's not respawning, you'd be playing deathmatch until the next round because nobody can get the Golden Gun.
You can only take one armour if you have the Golden Gun, and none if you already had armor before you picked up the Golden Gun.