I partially agree with vometia, homewer some little drawback to certain tricks it's not a bad idea.
I suggest to make a flee cooldown, something like 15-20 mins, to discourage the abuse.
It's not a complete and safe solution, but if you are ready to wait 20 mins just to artificially simplify some fights, well, just download cheat engine.
Why does it need to be discouraged? It's not really a problem at all let alone something that needs solving, especially not with an approach that could have unintended consequences. Just let people play their games as they see fit. Making something artificially awkward to use doesn't really seem any different to the sort of handholding that's often complained about.
