How about: After the player clicks to dismiss the textbox, they can view the full screen for as long as they like and there is a "CLICK TO RETURN TO THE MAP" message subtly at the bottom so they click again to return to the map? It's only one more click and these events don't happen so often that this will become annoying I feel.
OR!!! I have just had a further idea.
I was never quite sure when the game action was paused when I was testing, and the passage of time is quite vital in the game. If I went away to do something I would always superstitiously save the game and then reload when I came back to make sure no time had passed.
You could include a PAUSE feature in the game and, while it is paused, show this beautiful screen with the above mentioned "CLICK TO RETURN TO GAME" message unobtrusively at the bottom.