Load next on keystrokeInstead of loading the next file based on a time delay, the space-bar could be used to trigger the loading of the next file.
Backspace could load the previous file. This would allow the creation of a set of files that could be used as presentation software.
Image cellsAdd the ability to have small images displayed in the mechanical lines
FontsAbility to set the type face of the heading (non-animated) lines. Not sure how important this is.
Instant Messenger accessImagine having an instant messenger client accept text messages (such as AIM or Google chat client, etc) and display them on the sign.
Ability to hide the clockNote sure if this would be very useful or not.
Request for current contentA connecting machine could ask for the current screen rows and content.
White List and Black List of machines that may connect to a signEach sign could have a list of machines that may connect or a list of machines that may not connect to it and control it.
Reduced screen rows size to accommodate additional columns on a remote machine
See screen aspects for details.
Display data feedsFor example, stock prices or real-time train schedules!
Note that if there is a feature that you really want to see, I am more likely to consider suggestions from those who have made a donation!