I was just browsing an old website that I haven't visited in a few years and came across photos of LaGG-3 aircraft with skis. I'm assuming they were used in a ground attack role because most of them were equipped with rockets. There are photos showing later series 29 aircraft in 1942-43. I think it would be a good addition. Personally, I like attacking ground targets so I would enjoy having a LaGG with skis on the list.
Since we already have the LaGGs then it might be an easy fix to add skis to one of them (series 29?).
Link:
http://mig3.sovietwarplanes.com/lagg3/ski/ski.htm