I disagree with the "inexperienced rider" statement as well. I have been riding 38 years, have owned 32 bikes, and the 310GS stalls very easy when you are not used to the clutch. I sell BMW bikes and watch almost every single test rider stall the bike (and there are many experienced riders test riding them). Once you get used to the clutch ( needs way more gas than other bikes), it's fine. I have heard there is a remapping fix out that fixes the stall issue.
AS to the cold start, it says right in the manual that in cold weather, open the throttle slightly.