1.) The cable radius is the same, regardless if you use one or two pins for 
the W1 bus. So it only makes a difference regarding the cable weight, wich 
isn't as critical as the radius.

2.) To speed up the conversation time trigger all sensors by a broadcast 
message. After a delay of 750 ms you can read the value from each sensor 
which takes 11 ms per sensor. This means 22 sensors in a second (= 750 + 22 
* 11, and each further sensor takes 11 ms). You can reduce the delay by 
sampling at lower resolution (11 ... 9 bit). Check out the TRM. But 
(again), this feature isn't supported by the kernel driver.

BR

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