I dont understand what you need or what `one additional method of parameters coding` might be.
Ok. Now I need request details of certain money as follows: www.whattomine.com/coins/151.json?hr=<my_hashrate_for_ethash>&p=<power_in_mode_of_mining_ethash>&....But common info, which I can request from your site like www.whattomine.com/coins.json?utf8=...&factor[eth_hr]=<my_hashrate_for_ethash>&factor[eth_p]=<power_in_mode_of_mining_ethash>..... contains whole necessary parameters for all algo!
Please, parse parameters string for coins.json request and filter only needed for certain coin (algo) (You can get hashrate not from hr=, but from factor[eth_hr]).
Sorry for my English.