Hey so first up:
You can make a dice bag that includes all the example dice at any time by selecting the '+' button on the hotbar and choosing the dice bag icon, from there toggle the 'Example Dice' option and then select 'Create Bag' - the new bag will have all example dice in it, including the Lancer dice :)
Secondly:
A "Copy from tray" option is a very good idea, especially since I've been thinking about how to check the dice other people roll when I add online play. I'll add it to my notes and think about how it could be implemented for a future version.
Thanks for the feedback, and I'm sorry I didn't reply before recreating a die the hard way (though I respect your love for ensuring a die's preservation!)