I agree with you on the impossibilty to place your items where you want them to, and the limit of items you can place somewhere. However it was said that the housing system would get an update this year (i'm guessing at the end of the year, or perhaps early 2014..) so, let's hope they improve the whole deco/housing system a bit..
About the option to get a rohan house.. i don't think you'll get that anytime soon. That would require them building a whole new homestead (which could perhaps be possible when Helm's deep comes, since chars of all levels can go there), but i just don't see it happening soon, or at all.
For now, hopefully the housing system will get improved soon