http://jelastic.com/team? Is this a Russian company?
As far as engineers and such, we are on both sides of the globe, US and Eastern EU, so that we can cover all times zones well.
Not sure about adding a support phone number. I've always had bad experiences when providing that as another option for support, especially in today's hyper connect world. We find that most our users (>12k) prefer the forums, support tickets and Twitter and Facebook.
I do like your idea for a messaging system. I've actually been considering Olarq. I'll most definitely make sure that we talk about this. :)
Thanks for the suggestions!