Simplex: Here's what I meant about the boss. This was exactly me experience with this boss on normal with Flash mod:
http://www.gog.com/en/forum/the_witcher/spoilers_chapter_i_final_boss And that's why stunning the bosses is a thing that i believe, saves this game for me. ;)
I'll stay away from the difficulty modifications.
Especially that stunning isn't always as beautiful as it sounds. When fighting the Crypt King i was able to stun him, and after clicking him, i saw Geralt start to walk in his direction, and then just walk in one place, as in an invisible wall was blocking him, the creature got up, and bashed me with a single blow. Sometimes, when i stun an enemy and click him, Geralt takes his time, walks so slowly forwards the creature, that it gets up before receiving a blow. Sooo, stunning's both a bless and a bitch.
About disappearing potion effects, i took a Kot and a Jaskolka before entering the cave where Declan sent me. Quicksaved, entered, got owned on my first fight, reloaded, potion effects gone.
I wonder if CDPR will take an example from Arkane and release some patches to this game.