Dwb can actually "lock" a tab, so that it will always be shown. It split the browser in two, with you locked tab on the left and other tabs on te right. But that's not really tilling.
For this, I personnally spawn an instance of surf when I need to have the page openned in a new window (!s bound to -> open tab in surf). You can now manage it using the WM !

Anyway, I think tilling WM are overrated ;)