One heck of a suggestion post.
The actual idea was as follows: To allow the FREDer to assign hotkeys to specific subsystems in a similar manner as to wings and individual ships. Pressing "v" indeed doesn't quite cut it in some situations, and a hotkey would be a lot quicker. Stealth missions, in particular, would benefit from such system, one key would target a ship and cycle through subsystems the player has to scan. Also, missions where the main objective is to disable beam turrets on warships could have all "high priority" beams grouped onto one hotkey. Pressing it would cycle through the entire "important turret" list, switching targets if necessary. Also, all ships which still have such turrets operational would have white brackets drawn around them, doing wonders for situational awareness.
There's of course a lot more possibilities for such a feature, but the two situations I've described are incredibly common, appearing in retail campaign, BP and DE, just to name a few.