For posting pickup missions, I wish the organizer had the ability to browse and upload additional maps/charts/pictures viewable in the clipboard by everyone in the mission. Lots of times walkons come in last second to scenarios and they do not have any external details usually posted to the BBS or emails.
Been asked for, I know, but also the ability for a mission organizer to pick a skin for each flight in a pickup mission. If a player does not have the skin downloaded, the the default is automatically loaded like normal.