Forums Feature Suggestions Sending large texts

Is there a function, or will you consider adding an option for one, that allows the command-line bar to expand down/upward when exceeding the width, so that you can easier see everything you've written instead of being forced to scroll back with the arrow-keys?

I (very) often write very long posts and everyone else on my network do too, so this function would not go to waste, if at all possible.