[Dovecot] System-wide sieve script?

[Ty! Boyack]

In the dovecot LDA documentation, it mentions having sieve scripts 
located in ~/.dovecot.sieve, which works great for per-user sieve code.  
I was trying to find out if there was a system-wide sieve script (maybe 
/etc/dovecot.sieve?) that would hopefully be run first, followed by any 
per-user sieve code. 

Anyone know if this is already possible, or if not, if there are any 
plans to implement this? 

I'm assuming one could make a kludgey fix by having every .dovecot.sieve 
include a system-wide file, but that would allow a user to remove that 
"include" if they choose.  I'd like to have a centrally controlled, 
immutable set of rules that all mail goes through.

If I missed something in the wiki or archives, I offer my apologies in 
advance.

Thanks!

-Ty!