change Staff hara-kiri-ability on the fly?

[Kieren MacMillan]

Hello all,

Just wondering if anyone has solved the problem of turning the hara- 
kiri-ability of a Staff on the fly?
i.e., I want to dictate, at any point in the score, whether  
\RemoveEmptyStaffContext will act on (i.e., remove) a Staff,  
regardless of whether that Staff has only whole-measure rests in that  
system.

Thanks,
Kieren.