It's there. You need to disable multi-monitor taskbar though. Which flyouts are not multimon aware?
It's there. You need to unlock taskbar though.
Those challenges are intentional since 3.8.
Fat chance.
That would be 'partially grouping' then. What should happen then if you have two instances and close first one? Would one that left move to combine with pinned one? One pinned one unpinned as is? Move pinned position into new instance?
Where should second instance launch? Alongside first one or at the end?