Can you aim with a lightsabre? Whilst the rules don't specifically say no.... It says you can aim with a weapon

Yes, you can take the "Aim" maneuver with any Combat check (even a Brawl check).

😁

I regularly aim my wookiee Doctor/Marauder's Pressure Point brawl attacks. Gotta get in the maximum unsoakable strain damage before he tanks all the hits and goes down.