Pete:
In our case, we have existing relaitonships and don't want to go through the hassle of changing the snapmirror schedule for each and every one.
I did try to import the relationships into datasets for monitoring only, but I discovered that when I get an alert for a dataset lag it doesn't specify which snapmirror relationship is lagging. This requires quite a bit of investigation if multiple relationships are in a dataset.
If the snapmirror lag errors for the datasets specified the offending relationship, managing the relationships at the dataset level would have been an option for us.
Thanks,
Chris