why all the miners are not working in solo mode minus the 3.7.8 version of cgminer? i find this utterly stupid
Because no one cares to fix solo mining in SGminer. I don't maintain it.
there is a way to mine in solo feathercoin, with nvidia?
NSGminer supports all NVIDIA OpenCL capable hardware down to the oldest cards like 8800GTX. However the Maxwell generation runs better with CCminer.