-Is someone at Bethesda following the MOD scene by testing them? Have you ever been genuinely impressed by a MOD to the point of saying "How could they do that?!?". Are there some mods for Morrowind, Oblivion or Skyrim that really impressed you and that made you considering to hire its creator or include the concept into the next game?
-On the PC interface: some people attribute the shortcomings of the interface to the fact that also the PC version of Skyrim can be used with an Xbox controller. Oblivion had a different interface that worked well with a controller yet it never received so much criticism from PC users. Are you surprised by the feedback from the community? Would you design it somehow differently in light of the criticism?
-Is there a technical reason, coding or scripting limitations, that allow you to make Followers able to carry your gear, but will not allow you to create a horse that can carry your gear, or is that a design choice?
Some great questions in there, and I'd love to see BGS employees respond to some or all of the ones you listed.
That said, the questions I quoted above, IMO, should be redone or removed.
BGS following the mod scene: BGS long ago cited a couple of mods that influenced Skyrim, so IMO this question has already been answered, though it would be interesting if devs want to list particular mods they like (if it's new info).
Many people hated the Oblivion UI, and DarnUI was one of the more popular mods. I think (no proof) that people hate the Skyrim UI even more, but this question isn't likely to result in an informative answer. (BGS got big complaints, had an example of how to make users happy, ignored that, and got even more complaints with the next game = not likely to get a satisfactory answer.)
The horse gear question is an easy answer if you're familiar with the mod scene. There aren't technical limitations, it was just an oversight, or a matter of prioritization.