Changing the way threshold value is displayed for alerts/events

I'm new to Zenoss, am using Zenoss5 and experimenting with the best way to monitor a windows server system. I've tried both WinRM, and SNMP with SNMP Informant. The file system thresholds display the way they should when monitored with WinRM. When using SNMP, they are showing in i'd assume block size which is really useless, I'd rather see this in a MB or GB format.
threshold of high disk usage exceeded: current value 732515059.000000

Here is how the WinRM format looks
disk space threshold: 97.3% used (1.3GB free)

I don't know exactly which method is "better" for windows, it seems like SNMP gives more information.
Is there a way to change how the threshold will show for SNMP I'd ideally like to get an email alert that shows all the values, Total Size, Used Size, Free and the percentage used or something in MB or GB.

Thanks