It's an extension to help with coin switching pools.. https://bitcointalk.org/index.php?topic=850620.0
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i have no clue how to apply this to Spondoolies SP20
i have;any help would be greatly appreciated.
i tray Spondoolies-SP20-cgminer-4.8.0.zip but link dont work
please help
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This feature is designed to allow for a more consistent hashrate on the nicehash/westhash pools.  If you don't mine on those two pools, you don't need to turn it on.

If you do mine there, upgrade to the latest version of firmware and turn on the "2" flag--you should find a green check by the "extranonce subscription" field to the right of your miner on the dashboard at nicehash/westhash.
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can i earn more on nicehash/westhash whit sp-20. now i earn 0,015-0,02 btc f2 pool -antpool ghash. best earn et f2pool (by my experience)depende by pool luck.i 2 time day change pool
if find on pool whit poor luck   block like this on antpool   4h 3m 17s   335.02%
   1h 31m 25s   112.17%   
   2h 23m 58s   178.54%
i switch at antpool because usually after this come 5-6 quick block.i have 15 sp-20.
i need any help and luck for return my bad investment.Or wife kill me on summer when i told this year we don't go on holiday.

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put nicehash first on your list   use a high price in the password spot on your  pool section

use p=0.0199  you will only run  if price is over 0.0199    that is a very good price to mine at if price is lower you drop to your second choice on your pool list.

you could use this one for second:

https://www.f2pool.com/   this is paying 0.01097974 BTC / Thash/s  that is about  0.2194 a day for 20 th

or use my favorite :

https://mining.bitcoinaffiliatenetwork.com/index.php    this pays more then any other pool but can be slow to pay.