Yes, that sounds normal to me. All 4 cycle engines need extra fuel/air when they are cold. Cars and trucks used to have a fast idle cam built into the carb mechanism. Fuel injection and computer control, adds additional fuel/air to increase idle speed when engine is cold.
With the bike over on the side stand, I'd say you're increasing the fuel level of the carbs, and thus adding a richer mixture. If that works for you, just keep doing it................that's your fast idle mode.
Edit: You don't have to stand by the bike, just turn up the throttle idle speed screw and walk away. While you're putting on your helmet, and checking the latest text messages on your smart phone, the engine rpm will increase. After a few minutes, turn the speed screw back to normal 1200 rpm.