Is there a way to override the WMIMemory sensor default threshold on a case by case basis?

For the most part the default WMIMemory threshold of %20 seems reasonable but in some instances specifically on Exchange or SQL servers where by design the database uses most available memory I would like to be able to ajdust this threshold manually as I can with the diskfree min/max default of 10/25. Is there a way to accomplish this? I have searched the program, knowledgebase and manual and for what seemed like an obvious issue I have been unable to locate it. Secondly, and off the point completely is there a way to sort the devices alphabetically? I was able to drag and drop devices into different groups which I realized after the fact that I should have created the groups prior to autodiscovery but now they are not in any particular order and I dread having to manually sort alphabetically to make locating devices in the list easier.

Thanks for a great product.