For mobile clients, it would be useful to be able to have stacked tabs. I.e. where the page width is large enough, tabs would be on a single row. Where the page width is not wide enough, then the tabs that don't fit will "wrap" onto the next row.
Terrible Paint job...
The current arrow scroll thing is not very useable, and I will always avoid displaying this at all costs (I will shorten tab text so that it doesn't show - actually maybe this is only in Vision...)
this param seems to be used in several places, at first sight it doesnt seem like you will be able to just replace this with auto or something for a truly dynamic wrap, since now you will only have 2 rows max. (well before a scroll bar appears atleast)
the frame underneath the tab doesnt appear to have shrik scaling, so if you put a view into it the view might get a scrollbar unexpectaly (i think, i have not tested it but thats what it looks like at first sight in css)