DHCP threshold scope 80% full windows2003 server

We're using "DHCP server" on a windows2003 Server.
We're getting these errors:
Event Type: Warning
Event Source: DhcpServer
Event Category: None
Event ID: 1020
Date: 3/08/2005
Time: 19:50:48
User: N/A
Computer: NETSERVER
Description:
Scope, 10.156.32.0, is 81 percent full with only 35 IP addresses remaining.

==> I found http://support.microsoft.com/default...b;en-us;165006
that the threshold cannot be modified, but it's for NT4/3.51. Since
Windows2003
is pretty new and anvanced, I wonder if there's still a way to change it.

Thanks for reply's.
PS: it's not an option to expand our scope. I want to set the threshold to
90%.
PS2: filtering out in our monitorring isn't an option too. We have 150
Scopes to
manage ....