in wilkinsons last year i bought a little disc thing with a long protruding part, like a tongue (hard to describe!) the top of the disc is covered in a clear cover and you can twist it and it has different sized holes and when you twist it you can release even small seeds very easily and evenly, this is a useless explanation but maybe they have them this year!
What works very well for me is a rubber topped eye-dropper. The kind you use to suck up liquid medication for children. I find them at our druggist. They suck up as much seed as you want and then they can be applied one at a a time to the desired ares...