Sorry, I know this idea has been brought up countless times, but I honestly thought it'd have been implemented by launch time, so I'm going to say it once more...
I would really like to decide exactly how many of something I can donate to shrines. Especially when quests exist such as "spend 997 favor at your skill's primary god's shrine", it'd help to be able to be precise. Maybe 8 pleasing ambers with a shrine powder gets me exactly where I need to be, but alas, I can only choose to donate 1, 3, 5, 10, or all?