I love this! I recently built a Lighthouse home and realized even more that we need at the very least, spiral stairs. I would also love an option to put runners on the stairs for a better, fancier, look or maybe carpeted stairs. This would work very well as a free update to the base game as it wouldn't make sense to make a pack revolving around stairs.
And imagine the interactions that could be implemented! Toddlers and children can slide down the stairs on their bums while teens, ya, and adults can slide down the banisters. I've never played a clumsy sim so I don't know if they can trip on stairs or not, but if they can't it'd be nice if they could/
I never realized until I read this post on how limited builders are in game play. We can't create dome houses for caves and such, no glass roofs to look at the sky, no indoor balconies(well from what I know, I tried making one and it failed horribly), and for the basic stairs we can't put small rooms in them.It'd also be nice for the ladder bit, for climbing up walls, into attics and into basements.