IE Implementation?

Firstly this is an amazing tool, thank you so much for making it :)

This is more of a feature request, and I appreciate that using the IE syntax for grid isn't always the best way to go / a viable solution. However, may be nice to have the option to generate the code for this, as sometimes autoprefixer doesn't quite do the job. Maybe this would be off by default and be an option that could be toggled on?