Some questions on PoA in the light of Karvy fiasco

My broker has these user privileges active/inactive:

NSE equity/BSE equity ALLOWED
BSE MF/NSE MF ALLOWED
Cover Allowed
Coll sell Allowed
Encash Allowed
Intraday Allowed
E margin Allowed
Cash Allowed
SIP allowed
Sor allowed

NSE DERIVATIVE NOT ALLOWED (apply)
MARGIN NOT ALLOWED

Do you think having derivative and margin disabled makes the demat safe? I do not know the meaning of things like Cover/e-margin/Coll sell etc so do not know if those can be misused or can create loopholes?

My Broker holds POA, but the new specific POA which SEBI implemented off late. Earlier there used to be a horribly worded POA called General POA which was scary to read.

Also my account is a joint account which means no easiest etc for me.

Thanks in advance