nsupdate .jnl files and flushing

[J.D. Bronson]

I was wondering if there is any setting/tweak to get Bind9 to write 
the .jnl file any faster than 'when it gets around to it'...I am sure 
there is some specific time, but it always seems to vary for me.

I have noticed if a client is updating bind9 too fast, bind9 will 
accept the updates but never answer with the new IP until I do an 
RNDC FLUSH or restart named...

so, I was looking for a tweak or something to work around this.
As long as there is a decent interval within the nsupdates, there is no issue.

-JD