I know it is not possible with the actual upgrade cards (even not with Valen Rudor and Squad Leader), but hypothetically:

Can a TIE/sf attack, then make a movement action (boost or barrel roll) an then attack again (possible the same ship) with his rear arc.

Or are all "after attack" phases referred to happen after both attacks?

It would be nice to have a TIE/sf only tech upgrade card where you can make a boost or barrel roll after the (first) attack. It would be a neat push

"Free attacks" happen explicitly after* ANY other "after attacking" effects, primarily to shut up the Dengar crowd trying to attack before any after attack token / actions apply.

In theory, yes, any ship that can get a free action (thus, boost or barrelroll) can reposition then attack again. However i dont think such a combination exists atm. The only ships that can attack twice either are retaliatory (dengar, quickdraw) or dont have any way of generating free actions off of attacks (defenders, ywing title, ghost w/ phantom)

I could be wrong and there is such a combination somewhere, but ive never seen it.

theoretically if you had a way to injure yourself before you moved on quickdraw (via some weird pre-move baffles sort of deal) you would shoot then take your dialed in move then shoot again in the combat phase.

its the same principle as baffled rage

well...you could Adv Sensors into Daredevil on Quickdraw and not have an EU equipped.

Roll 2 dice, suffer hits and crits. Might not do anything, might take 2 hits O.o

theoretically if you had a way to injure yourself before you moved on quickdraw (via some weird pre-move baffles sort of deal) you would shoot then take your dialed in move then shoot again in the combat phase.

its the same principle as baffled rage

Upsilon Shuttle with Coordinate action. Just Rage+baffle before you move. Shoot with full mods and do a green to clear other stress and do focus action and then shoot full modded attack again in the combat phase.

Yeah, the Oopsie is gonna make a WHOLE mess of crazy happen.

If you houseruled a Turr Phennir TIE/sf pilot then yes, he could attack, boost or barrel roll, attack and then boost or barrel roll again.

theoretically if you had a way to injure yourself before you moved on quickdraw (via some weird pre-move baffles sort of deal) you would shoot then take your dialed in move then shoot again in the combat phase.

its the same principle as baffled rage

Upsilon Shuttle with Coordinate action. Just Rage+baffle before you move. Shoot with full mods and do a green to clear other stress and do focus action and then shoot full modded attack again in the combat phase.

theoretically if you had a way to injure yourself before you moved on quickdraw (via some weird pre-move baffles sort of deal) you would shoot then take your dialed in move then shoot again in the combat phase.

its the same principle as baffled rage

Upsilon Shuttle with Coordinate action. Just Rage+baffle before you move. Shoot with full mods and do a green to clear other stress and do focus action and then shoot full modded attack again in the combat phase.

coordinate is going to be so sick dude