Jumping out of combat, repairing and flying/jumping back into combat is perfectly valid tactic. However with the 30 sec charge time it's a bit too easy and risk-free. Increasing the charge time a bit (say, 45 seconds) and lowering the consumption so ships can jump with the same amount of fuel should do it.
Jumping out, suiciding and respawning in the same system to rejoin the fight is clear abuse that is not really different from suicide trading and should be treated the same way.
I'm not sure how solo BS fights are relevant. Either ship can cruise up at will anyway.
