zfs snapshot -r add -t type parameter

How hard would it be to add functionality to the snapshot subcommand to allow for recursive snapshots by dataset type?

Let's say I wanted to snapshot every "fs" dataset within the zpool, excluding zvols.

Currently I have to run multiple snapshot commands or run snapshot -r and remove the snapshots for the zvols manually.

When creating archives of Solaris 10 and 11 installations, there's no reason to backup dump and swap zvols and in some cases, if the size of the dump and swap zvols are large enough, it will cause the zfs snapshot -r {pooilname} to fail because there isn't enough free space to allow for the dump and swap zvols to be included in the snapshot creation process.