See the below screenshot. What.
I think I've found it. Atleast, this seems to be the very system that I've found used on other servers I've played before.
Seems pretty straightforward (and easy to implement?).
the enemies can still hear you even if they cant see you, you need to get a sufficient distance from them for them to stop attacking. they do have the blindness penalty though aka 50% miss chance
This is what I meant, the creatures keep following me throughout the entire dungeon. No distance is far enough.
I've seen this on other servers. Without going too much in detail there was a tool (playertool in the radial menu) which would allow you to select a henchman/summon and order it to specific spots by clicking the same tool again on the ground before you.
This provided for much more efficient summons and gameplay all together (summons don't trigger the traps if you guide them around them.) And it has it's uses in Roleplay.
This suggestion is made because I haven't found a tool alike it just yet. If it's already IG, then sorry and please ignore!