According to the CVS they have already planned to disallow climbing stairs while overloaded. I think they'll still allow decending of stairs.

By falling down them, ala Nethack hopefully.

Of course.

and probably with spectacular results: "you fall down the stairs!" "your wand of striking breaks!"

Most assuredly. You wouldn't think I'd ruin the spirit of IVAN by adding something without making a worst case senario involving multiple dismemberments practically inevitable?

You fall down the stairs! -more- You roll off the bottom of the stairs. -more- You hear clanking of gears! -more- You fall through a trap door! -more- You land on iron spikes! -more- The spikes were coated in poison! -more- The poison was DEADLY! -more- As your impaled poisoned body hits the bottom of the pit-- You hear a *click*! A BIG MINE EXPLODES! -more- Your right arm is severed off! Your left arm is severed off! Your backpack full of gunpowder explodes! Your Chainmail breaks! Your helmet of Charisma breaks! Your left leg is severed! Your wand of fireballs explodes! Your right leg is severed! Your wand of resurrection breaks! Your wand of striking breaks! The Wand of Striking breaks the spikes! You are in a pit.... You pray to (Whoever the god of nature is) You feel an earthquake! A giant boulder crushes you! You die.... Would you like to see your inventory? (Y, N, Q) Now THAT is worst case scenario

now THAT is the most powerful character made! impaled, blown up multiple times, poisoned, and he can still pray?

Yes, he was about to beat Elpuri.

if that's so, then I guess he/she'll be put off IVAN for a month or two...

No kidding, yeesh...