Do people still not know about backfire damage on sabotage? Still, it's not going to hit very hard without cloak bonuses, and synthetic hacking is complete garbage. I wonder if homing grenade will even be buffed by tech vulnerability..
If you ask me, Turian Saboteur will be the perfect chance to buff both the female quarians a bit.
Sabotage not granting points based on the backfire damage probably has a lot to do with it not being seen more, although with the challenges it makes getting points with bad guns easier (as long as a teammate doesn't pick off your sabotage'd enemies).
I've experience fire delay on the gets turret, but it's fairly negible. However, I've notice that even though the turret spits fire, it doesn't actually ignite enemies reliably. Sometimes I have to wait a few seconds and sometimes they do not get ignited at all! I am not sure if it's just me.