Is there any possibility to control particle elements in game? I see that in header is container of single particles but i'm not sure if there is any possibility to use that.

yes just edit particles.p[0].xxx=

check SDK tutorials for BloodFx, there they are set manually

I think that this isn't what I mean. I'm creating rain in my weather system and when it's start to rain I want for example particle elements set to 10 and then with volumetric clouds size, rain particle elements will linear grow to 1000. What I see from bloodFx I can change particle elements size only when I'm creating new particle.