Overwriting custom alerts when importing a new data source

Hi,

This is really annoying. I have to set custom alerts for our data sources for things like VMware data source usage. The default data sources only give you an error alert when the disk gets to 99% not a critical. I always change this as a data source filling up will take your Vm's offline. I do this for quite a few other alerts too.

I then see a new VMware data source that you guys put up and get excited and apply it strait away....overwriting my custom alerts.

This normally results in an outage because we didn't notice a data source filling up and a phone call from my boss.

so my feature request is...can you guys allow us to 'write protect' our custom alerts so we can import new data sources preserving our custom alerts or changes? Please???