combo.css = this._createURLlist(this.appConfig.yui.comboBase || loader.comboBase, comboCssParts); and then put
it works well for me, with second server on node.js that serves combined yui urls - but if you want - they can be merged simply.
For serving combined yui - try combohandler: https://github.com/rgrove/combohandler or npm install combohandler nice tool to combine js and css - works with yui - sample exists on github. you can integrate it via middleware, and mojito server will serve yui (but it seems for me, that dedicated server for yui combining is a good practice - it tooks pretty much time to process request)
Alexey: Thanks for helping out! We really appreciate it. Your patch would make a great pull request, and we can incorporate it into the Mojito tree. Would you like to submit one? Here is how to get started: https://github.com/yahoo/mojito/wiki/Contributing-Code-to-Mojito