Maybe the best solution would be adding another extra "singleline" for users with one line output text display.
My intention was to make the watch show short messages (I send via Tasker) as one line scrolling text (e.g. "Phone battery low!") but be able to show longer messages in 2 lines. The desired behavior should be switchable from the sender, not automatically by OpenWatch. Also the rest of the OpenWatch features shouldn't be touched by this.
btw: I'm currently playing around with Tasker and writing a web-service so that my PC at home can send notifications to my watch over the Internet.