Would it be possible to ensure that the default value in a drop-down list is always either none or all.

For example if the "group" drop-down is set to a value and then I navigate away from that screen, on returning it still has the old value - it should rather reset to its default value, namely "all".

Another example is on the Monitoring -> Triggers Page. Could it always default to "group - all" and "Host - all". So If I have changed one of those values and navigated away from that page, when I go back to it it is back to the defaults.