i would like to see more particle effects.
RPG games have many different effects. and since the engine began to develop rapidly he needs more effects.
what do you think about this?

You can easily create your own using the particle editor. You can also create them in code. Take a look at the particle tutorial.

Weather Effects are on the Roadmap and you can create some neat effects with code. Play with the particle editor and you get some neat results (as fatcoder said).

i meant that the engine is developing and growing and need to fill it with different built-in classes.
i ask not for myself, i already have the necessary effects
for myself, i made a Line, Trail, ParticleCollider and many others.

That's also on the Roadmap. Additional built in classes.

Hm, I can't see this on Roadmap at the moment, maybe done before...but I wonder if there is an editor planned, like UDK Cascade...this would be awesome to have such kind of ParticleSystem editor, so you dont have to code all those things, and embed the resulting ParticleSystem in pak.