Yep.
Note it's not ideal, many moons ago lars had hardwired the tabs into the navigation-generating code for subsite.
I didn't want to break backwards compatibility with that scheme, so I merely moved the hardwired stuff out into parameters, so at least it can be changed.
The layout manager page tabs are then built into that same structure (a multirow).
It's all a bit awkward, unfortunately, but short of starting over and designing stuff without worrying about backwards compatibility, not too much can be done.
Same is true with how theming packages work.