FYI:

There's a new firmware release for the 2930 on the Draytek.com site: v3.2.4.1 was released on 17th May.

http://www.draytek.com/user/SupportDownloadsDetail.php?action=Load&MID=14&ID=374

I am just mentioning it here as I am hoping it makes dropped VPN re-connections more reliable. There's no specific mention of any VPN fixes in the release notes, but I see that if you look at the connection management page on the router, the 'Remote IP' column also lists the WAN port used for the VPN (which in itself is very handy), so I am hoping that other tweaks have been made.

The release notes do say that an issue with WAN load balancing has been fixed so I am being optimistic that VPNs behave better too - it's too early to tell yet as I have only been running the firmware for a few hours, but nothing seems to have broken yet.

It should fix PPTP problems which I think are present in the 3.2.3 firmware, it adds mOTP to dial-in VPNs too, which should be handy for some people.