Why not multiply "six confirmations" and divide Time-Between-Blocks and Reward by the same factor?
In consideration of replacing the 1 block with N blocks in the same time frame, N &gt; 1, I see the following points:

Advantages


Expected time until first confirmation is reduced
Mining revenue is distributed smoother among pools
Capacity of network is increased
Smaller peak traffic than increasing blocksize by N


Disadvantages


A hardfork is required to adjust the block interval
Increased chance of chain forks and higher stale rate due to block validation taking a larger portion of block interval
Thin clients need to store a larger amount of headers
Slightly bigger bandwidth usage than larger blocks




Still, it may be that 10 minutes is too conservative and a smaller block interval would provide an overall benefit. For example, at Scaling Bitcoin Milan, Arthur Gervais presented simulation results that he interpreted to suggest that Bitcoin could safely use 1 minute blocks.

CoinDesk covered the topic in A Lower Block Time Could Help Bitcoin Scale, But Will It Work?.