CFB,
Timothy is almost an annual here - just doesn't persist - but, seed is cheap, and when I'm frost-seeding clovers, around mid-February, I mix timothy seed in with the clover seed - they're similar in size - in order to get better/more even distribution of my clover seed. Any timothy that comes up and actually grows is just 'gravy'; but I don't count on it providing grazing for more than one season.
I'll be broadcasting annual ryegrass on one 25-acre pasture that's got a relatively thin stand of Max-Q fescue, just as the cows make their last rotation through those paddocks in late Aug/early Sept, before we pull 'em off to stockpile that field. Annual ryegrass works great down here to provide lots of late winter/spring grazing, and it usually reseeds well enough that I don't have to re-seed any more for several years.
I long for one of those Herd ATV-mounted seeders agmantoo has - they're the best! Before I knew about the Herd, I bought one of those crappy Moultrie Feeders models - guess they're OK for folks planting wildlife foodplots, who have plenty of $$$ to spend, and don't mind if they put out more seed than they need to, but if you're trying to accurately and evenly distribute 2-2.5# of ladino clover seed/acre...good luck.
I'm getting a Herd before next spring.