We are planning to add the option to confirm for web, but I don't think many people will like it for faster time controls. Having to confirm each move is going to put you are a serious time disadvantage compared to people who don't use it.
It will likely takes you ~1 second at least to hit confirm. If you play a 60 move game, that is giving a whole minute advantage to your opponent.
I am willing to bet that you will lose more games on time because of confirm move than you would lose due to mouse slips.
I absolutely without a doubt hate mouse slips ESPECIALLY when they cost you a game that you most definitely should have won. I am by no means a master, but after long calculations, it sucks to just "slip" it all away and lose.
even worse is during the end game, you might have the slightest chance of winning but then in a second it just disappears. I'd rather lose straight up than lose to a mistake.
It's like I can feel my opponent pause just to make sure I haven't come up with some brilliant move, laugh, shake their head as they take my piece, and lean back because they know it's over.
Why can't we have the option to confirm just like on mobile?!
(breathes deeply) Rant over. Time to play another game