I've been using SMOS ever since you added NvOS and it's been great. I think Linux is a much better choice than Windows when it comes to mining. It is so much easier to overclock and test on linux.
About adding new miners, while I do agree with keeping the number of options small to keep it simple, I think it would be good to retire older versions of miners that people aren't using as well if you keep usage statistics. This should reduce a good amount of clutter.
Other than that good job and best of luck.
I vote for dropping legacy versions maybe keep the latest 2 versions at most or allow users to choose the version as a dropdown menu rather than just a large list of different miners and versions