searching for acceptable quality shadow mapping techniques
Well nevermind. I made some research and actually gonna:


sample ESM using Poisson sampling in PCF fashion (thanks Bart Wronski for great Poisson Sample generator app) and extend this to PCSS technique (variable penumbra). Render to texture.
optionally depth aware blur to soften - EDIT not so fast this option doesnt work as expected, too bad. Instead rotating PCF kernel seem to work fine. 


And too bad not much of discussion here.