Yeah, that could be very useful! Even for making simple smoke effect!

That's a reason why you should buy Com/Pro
If all "good" features would be in the free, nobody would buy Com/Pro

Yes, you are right. But I'm not asking for all features, BEAM and STREAK were available in free LITE-C version.

I think STREAK only but not BEAM (It is for Com and above).

Features normally only move between editions when a new engine comes out. That would be A9, so you could wait a couple years for BEAM and STREAK. As to rolling, that's like many things in life - some here know how to do that, others don't. Some things are just not for anyone.

But to make simple spark effect for example, I need BEAM am I right? And to make simple rain effect, where rain particles do not turn to camera, I also need BEAM, am I right? So do I need to buy COM version of GS to make simple rain?

You dont even need particles to create rain or sparks.

Yes, I can create them with sprites, but with particles it will be faster, or am I wrong?

You could probably use sprite emulation and roll them, but at a big performance cost, hence the particle roll request.

I guess if particles could roll, they were sprites.