Note that might help in-the-meantime - Using the Review Feature (review tab on the ribbon>Start Review) will allow you to quickly ID recently changed or added nodes. It does change the color of the nodes, which, when printed, is still the pink review color. I tried to test if the color goes back to normal when review is switched off, but I didn't wait for the printing to finish and the program froze. Rebooting - but wanted to let you know.
I think this has been requested quite a few times. You can already manually set a date (with the default being today's date) as a topic property, but frustratingly you can't filter on topic properties; in fact it's difficult to do anything non-numeric with topic properties.
The way I think this could be implemented would be to have two default topic properties which could be optionally set by the user to be added either as a one-off or as a default to all new topics. The first property would be Date Created which would default obviously to the date (and time) the topic was created. This would then remain unchanged unless edited by the user.
The second would be a Date Modified property which would have a default setting of updating every time the content only of the topic was changed. The user could then add other "triggers" such as moving the topic to another parent, adding child topics etc, or changing formatting (though probably the latter should exclude "automatic" changes resulting from the Smart Fill feature, etc).
This facility would of course be useless unless it was possible to filter on either topic property, either for a match, non-match or range etc, similar to Task Info filtering. It should also be possible to search on either topic property; in fact it should be possible to filter and search on all topic properties.
And while we're on the subject of filtering, shouldn't the format of the dates shown for Due Today and Due Tomorrow in the pop-up Task Filters menu reflect the regional date settings in Windows instead of defaulting to the US setting? It's a small thing but it looks a little odd in "day/month" countries.