Support answered me, here google translate answer from them:
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Hello!

Your account has been temporarily suspended due to suspected hacking it due to the presence of spam messages through the submission of requests to add a friend .

When the scan was decided to remove the lock - and we are pleased to announce that you can continue to play!

Please check and adjust your interface modification that could cause such operation , reducing the frequency of invitations.

It is also possible that your account was temporarily obtained unauthorized access by third parties via Trojans and keyloggers which can be used to obtain the name of your account World of Warcraft and password to it.

Be sure to check your computer and brush the it against viruses . You can find the instructions by clicking on the link : http://eu.battle.net/security/

Good luck!
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So the main question - how can i increase delay in which OQ send batlle requests?
I do not want to have ban again.

Waiting for u hekp, Thanks

Were you leading groups recently?

The only time oQueue willl mass send friend requests is if you use the invite all button on the waitlist tab as a group leader.

oQueue automatically throttles howmany messages it sends per minute to prevent this sort of thing. It also limits the number of people you communicate with to 4 people for the same reason.

If you have any other addons which use whispers or friend requests it is possible one of those addons could have malfunction in conjunction with oQueue causing unexpected behaviour.

I was banned for this too, once. But I typically lead, and as the handsome orc above me stated, leaders do kinda have to spam inv's. Especially when people are tabbed, in dungeons, pet battling, in raid combat, lagging, in a loading screen, etc. I was unbanned by blizz the same afternoon, with the same generic stupid message.

on tuesdays, i run a celestials group for hours and hit my invite-all button constantly without issue

if this is an issue for blizz, they need to say something. there is no posted limit on sending friend requests.