Fence integration is brand new, and I like that feature myself. I do like the thinking of having it integrated further and new ideas are always welcomed here
I am not sure if the roll up feature would mesh well with the start 11 set up. While it could be argued that the tabbed pages can each hold a separate fence and that could fix it. Perhaps others that really like the tabbed look the roll up provides and want a more similar look. An idea I would have that goes with the start 11 design would be to make the fence dock have separate tabs.
For example it would look like this.
[fence name 1] [fence name 2] [fence name 3]
Each fence name could be clicked to open a separate on screen fence in an otherwise always open menu.
The idea sounds good to me as a compromise of merging the two different styles. I guess the question would then be, is it overkill to have a secondary tab feature or is it better to have just one fence page. Fences is an add on integration after all.