Baggage Compartment Bulkhead
Yes - the baggage compartment bulkhead is structural. There has been a lot written about this in the various forums. My opinoin is that you don't mess with it. The corrugations are there for strength and the bulkhead adds stiffness to to prevent twisting moments between the spar and tail feathers.
Of course this has not stopped folks from modifying it in all sorts of ways, often without regard to its function (or ignorance of it). My personal opinion is that any modification to it makes the aircraft potentially un-airworthy and would be grounds to reject it outright on a purchase inspection.
With a power screwdriver it only takes a couple minutes to remove the screws. Grin and bear it is my suggestion.