Given the roll-out of the new functionality to select which custom fields we want included in the Sort/Search/Filter options on the Index screen displays, it would be a great enhancement to include all of the system fields, too.
For example, I would like to be able to sort on Mobile Phone number and Device OS, which are system fields and cannot currently be used for sorting. This may be more of an issue with fields on the Assets screens than on the Incident screens.