I have had a few Kodes from new and current have the 2011 Kode94 so am basing my answer on my experience. Yes, the foot strap screws can be a little tricky to screw in for the first time. What I do is grab one of the screws by itself, rub it in a bit of bath soap for lubrication and then gently screw into the hole about half way. Take screw out. Repeat on the remaining holes you intend to use. Doing this makes it easier for the screws to grip when it comes times to screw in with the foot straps and anti twist plug. A bit of extra down ward force is required I have found with the new thick pads. Recheck screw tension after each sail especially at first. You want to keep them tight.
No to plugging the unused foot strap holes. :-)