ipsvd-instruct question

Hi,

I'm a developer on a project (SME Server - http://contribs.org), and we use
ipsvd to manage many of our daemons.  We really like how powerful it is and
the many features that it has.  We are trying to implement some access
control lists for ip ranges and I'm wondering if there is an easy way to
filter on ip addresses that aren't class A, B, C, or specific host.

As an example one network that I'd like to add has a netmask of
255.255.252.0.  With many programs I can just specify x.x.144.0/22.  As far
as I can tell with ipsvd I'm going to have to specify 4 entries: x.x.144.,
x.x.145., x.x.146., x.x.147.

Is this the correct or best way to do it or is there something that I'm
missing somewhere?  If this is the only way to filter is there any chance of
adding the ability to add entries of the form x.x.144.0/22 or
x.x.144.0/255.255.252.0?

Thanks,

-Shad