Hello guys,
Thank you very much for your advice - I'm very sorry to hear your application was refused

I saw your post when my passport was on the way already, so I went on with it - and last week I received the visa without further questions. I've been to Turkey and Iran for over 6 weeks each, it didn't seem to be a problem in Vienna. For anyone interested, here's my full report:
http://caravanistan.com/forum/viewtopic.php?f=3&t=3423
I'd still advice anyone to double-check before sending with your local embassy, it seems to become an issue...
I hope you find a way around!!
Chris