I would like to use the Materialize css library. Can BSS recognize it? Pete
I would say that answer will be no. You are not here to use BSS for Materialize, it's called "Bootstrap" Studio for a reason :P
Now, having said that, if you were to use Materialize and manually get things edited to work, then yeah you could probably do so, but you'll be on your own working with it and for support.
Maybe next time, just say "no". I can do without the sarcasm.
I use both bootstrap and materializecss. I would pay triple if bootstrap studio also supports materializecss - even if it only supports it to a basic level.