I don't know if someone else has already requested this but I would like to see "Command Completion" similar to the "Quick Emoticons" (and "Code Insight/Completion" found in many IDEs, such as Visual Studio).
I.e. if the user types '/' then a popup appears with available commands to select from...
This would enhance the usability of the many commands/features available in Plus! and would increase the use of them, many users don't even know about most of the commands/features...
( "Easter egg commands" could still me hidden
)
...and of cource a Preference option to turn this "Command Completion" off for those who don't desire it...