I'm currently working on OrganicCSS - a micro framework based on atomic CSS concept. I'm thinking a lot for name conventions, classes and of course mixins. I decided to combine three mixins in a file called _box-model.scss. They will provide a shortcuts for margin, padding and border properties.
I really like SASS and I use it a lot in my daily job. There are tons of useful features. However there are some things which I want to do, but I can't. There are limitation in the syntax and missing functionalities. Sharing what I found, I want to know if you meet those limitation and how you get around them.