Explorer ships keep flying to location with hostiles

[Xmudder]

In my most recent game, I found a system with a MSP Hive base and 2 hive frigates in a nearby asteroid field. My explorer ships keep trying to scan the asteroid belt, only to be chased off the by the hive frigates, which vanish from sight as soon as they leave. But the game does not remember that there are hostile frigates there, so the ships keeps going back for more.

1) Please have the game remember what was encountered even if it can not been seen on the map (this also applies to multiple multi k monsters listed as 500 fleet power if no one has been there recently).

2) Please allow us to forbid our ships to visit certain systems, to keep them from flying like moths to the flames (Kasim).