Character limit on message box

We want to display a message on screen showing basic operation as soon as the display is powered up. There seems to be a limit of 299 characters, is there any way of removing it? If not can it be added to a wishlist for a future update please? I can understand you would scroll several times if the message box was small but we have widened it up significantly from default, and 299 characters isn't enough to populate the message box.

We have got around it by showing a separate screen with lines of text, but its easier if we use the built in message box.