Hair various problems

Hi everyone!
I’d like to render some hair in cycles with strand rendering but the engine doesn’t have the option,i even try to download the latest build but it wasn’t included either.Is there an addon or something??
In addition,does someone know how to export hair to render externally in keyshot??I tryied to convert the hairs to mesh from the modifiers tab but when importing the obj into keyshot it tells me it can’t be opened since it has no geometry…

Thanks

P.S. something else unrelated to hair: I found that undo CTRL+Z shortut doesn’t work,how to make it work?

Please would someone help me???