Can you add native android browser detection?
For ex. (from StackOverflow):

var is_android = ((nua.indexOf('Mozilla/5.0') > -1 && nua.indexOf('Android ') > -1 && nua.indexOf('AppleWebKit') > -1) && !(nua.indexOf('Chrome') > -1));

Sorry to bother but no matter what combination I try, I can’t get Opera Mini in iOS 8 to work with the browser-specific-css plugin. Of the option below, the only one that does anything for me is the last one, but that only affects the desktop version of Opera (Mac).

.ios.operamobile .show-menu:after {
font-size: 1.625em;
content: "\25be";
}
.operamobile .show-menu:after {
font-size: 1.625em;
content: "\25be";
}
.ios.operamini .show-menu:after {
font-size: 1.625em;
content: "\25be";
}
.operamini .show-menu:after {
font-size: 1.625em;
content: "\25be";
}
.opera .show-menu:after {
font-size: 1.625em;
content: "\25be";
}

Any help would be greatly appreciated.

You push classes to HTML tag - but script overwrites them, instead of appending!
So if somebody has own classes or dynamic added via Modernizr (as in my case) - they get lost.

PS: As fast solution - load your script before Modernizr

can you add general IE family class in addition to versioned class?
ie10 -> ie ie10

can you add IE11 browser detection?