Hi, is the port changed from 3333 to 3334 and why this is so secret?

It was required to prevent accidental mining after the collapse of hotwallet.

What is the fee - 3,3 or 2,5% or...?

3.3% currently. Maybe not so profitable, but stable and DDoS-protected.

refreshing in realtime? (because "worker list" shows only zeroes in speed columns)

Statistics engine is shut down, but you can see internal data dumps here

http://ltcmine.ru/work_last10m.txt
http://ltcmine.ru/work_last1d.txt
http://ltcmine.ru/work_last2d.txt

All payments are handled manually, for the moment. I'm sending rewards to withdrawal wallets every 2 days.

If you cannot edit your site, maybe you should edit 1st post in this topic with this info.
And when Statistics engine will be powered on?