There are a lot of details on computers that would be best stored as Numbers, Percents, or the occasional version number. I would like to have a Custom Field type that can properly sort, and filter (greater than, less than etc) on Numbers. Currently all custom fields are sorted like strings, which does not work well all for this type of data, and the Greater-than, less-than filter logic is completely useless.
Enabling this sort of functionality would unlock the usefulness of all of my numeric custom fields stored as strings. The current work around is to export everything to excel or write a custom script to interact with the API.