can I run my own unofficial contest for everyone?
Yes.
But it depends on the contest on which board you can run it: usually it's
Games and rounds, Meta is a rare exception.
the forum's mission to be as free as possible.
Within the rules, of course. On-forum altcoin giveaways for instance will get you banned.
I want to conduct my honest competition (where merit distributing will be banned by contest conditions) so that there are no frauds.
If joining requires a post, the user can't help it if someone Merits them.
I will only have fair original nominations suitable for ordinary people. Not for farmers & other DT parasites
I'm curious to see your list of requirements