Many things could be done to improve the ironman and ulitmate ironman experience. Here is just a small list of things I have picked up from the Iron Help cc:
Gem bag - great when mining for ironmen, amazing for ultis for crafting.
Seedbox - great if you want to farm multiple seeds in a single run also storage for uim.
Battlestaff Crafting - Alternate crafting method also helps normies too.
Gem Store in new part of Tzhaar city - Tokkul for gems or possibly coding the gem stall for up to diamonds or maybe just rubys but no d stones or a rare chance to get one.
POH storage boxes - Frees up bankspace for normal players and lets UIM store some clue rewards.
Stashes for clue items - lets you store wiz hat iron pick etc. only need to code 1 to hold it all or something.
Im sure there are some other things, this is what we thought of at the time.