1.Make new .sab file, there structured just like .npc files, just read the ext_data helper for it in the MP SDK (it comes with definitions for SP things like .npc and .sab files).
2.You have to give to or play as an NPC that has Class_Boba ("Fett?") to get jetpack and the flamethrower. If your playing as the NPC it's the force lightning button for the flamethrower and double jump for the jetpack.
3.The NPC tool comes with a "Commando" template for this, but anyway, give the NPC the normal blaster pistol (not bryar) and have altfire checked (or have a line saying "Altfire 1" if your doing this manually).
Then give it Class_Reborn (not Commando, doesn't work), and give it level 5 stats, 200 HP+, and force jump level 1 atleast, that is, if you want him to be evasive and somewhat tough to fight.
Your auto-blocking is in vain! Only SP source code modification can allow you to block my desann-style attacks without being staggered now!