Debate: Birds

I've been encourageing bird-life into our garden - the seed, nut and suet-filled coconut balls have been a major hit, as have the seed-feeders. The bird table - crafted from an old Christmas tree trunk, found sticks, and the bases of three plant pots - is like a bird shopping mall. However! Pigeons are dominating and, whilst it's nature's way, I want to see more Coal Tits and the little birds.

Should I let nature rule the nut and seed roost, or should I intervene with feeding devices that bar the bigger birds?