That is not what the Blocktime is set at that causes that but the starting difficulty. With a low starting difficulty and a longer retarget time you get what is called instamining where the first blocks are mined at a much faster rate until the hashrate evens out.
FlashCoin actually had 10 second Blocktimes but anything under 30 seconds (as you mentioned with Quark) causes a lot of Orphan Blocks because of the latency between miners.
Ok thanks for the explanation.
Spoetnik would be happy , he doesn't need to lower the blocktime. He can start with a very low difficulty. It has the same effect
But then someone else can too with more mining power.