Kindo: Hmm... perhaps. I'm not going to let my potions expire every time I've used Berserk, though. I'd rather just avoid using it altogether. :P
Like many other small things in the game, I learnt to ignore it :). If I am in town though (as in I know I won't be needing the potion effects) I just meditate to get rid of it.
Parmenides: Yeah, those green visual effects get stuck. Are those effects controlled in the launcher? I tried figuring it out, but no luck dropping it.
I don't think there is any setting in the launcher to disable this.