I do not believe I will be allowing OSTs and here is why:
Much like with EPs there is a question of intent and equal judgment. The reason EPs have not been allowed in the past is because they are not marketed with the same purpose as a full length album. A full length album is a COMPLETE work made to stand alone as an audio experience. An EP is a piece, a snippet, a sampling and is usually not meant to stand as a finished and complete work from an artist. In the same respect an OST is not meant to stand alone, its value is derived not only from the quality of the composition, but perhaps even moreso in how it compliments a visual element. Because of this comparing it alongside a normal album is like comparing apples and oranges.
We all have things we'd like to include in these lists, I personally think that there were two live releases this year that would be in my top 10 if they were allowed. However please understand the rules are in place to provide a level and balanced ground for a certain type of output to be compared. This is not the end of the world, just post the top 10 albums that fit within the framework and everything will be fine.