sariaen: Witchers have Kaer Morhen. Witchers do not buy houses and do not live amongst people. That would be immersion breaking. What I would suggest is having some tabs in the inventory and maybe making the horse a mobile, separate chest.
robbertharkink: Why not have a storage box at the bank or at inns, how is that for your immersion?
Pretty sh** :) And contents of those said, boxes, miraculously teleport from one inn to another to suit your convenience? What mighty spark of logic brought you to that conclusion? :D I am all against that! However, there are already mods available, for all gamers with a kleptomaniac syndrome :)
Most probably they will add it anyways. Good for you. As for my immersion, I can always refuse to use them.