The hack is to prefix each task name with the initial letter of the category - ‘A’ for agenda tasks, ‘C’ for calls & emails and so on. It does assume that you’ve only got 26 categories and they each start with a different letter of the alphabet, but hey, I did say that this was a hack, didn’t I?
Then hitting a letter key in the main tasks display will filter the list down to those categories that start with that letter - in other words, hitting ‘C’ should filter everything in the ‘Calls’ category.




