The issue that I am looking to have solved is explained below:
When you are writing a private message to a player, the message box closes if you click on your screen to walk somewhere, interact with/attack an NPC, or pick up an item. This is tedious in that it forces you to rewrite the private message, and, when writing the message, you're restricted in what you can do with your character, which proves very difficult when in combat or even trying to buy/sell items in Falador.
This is not a very pressing concern; however, it would be wonderful if this could be changed in the near future.
Thank you.