Canned messages in broadcasts

If this has already been discussed I couldn't find it, please accept my apologies. I would like to be able to use a fixed set of messages in my broadcasts. I can write them in a text editor and keep that window open for copy/paste into the broadcast dialog, but it would seem to be easier to use canned messages. Currently the F keys do nothing when the broadcast dialog is open. When it is not, the F keys put the canned text into the new message area.

Thanks for consideration.

-Al WA1TYB