HI Dean

All plants love the compost. You can put it on any time but you might get some leaching in the fall and winter I usally put mine on in the spring provided it is truly composted. I mean finished compost. I really like compost better than manutre as it has fewer weed seed in it. You can put it on as thick as you want as it is slow release and you can't burn the plants with it.
Later Butch

Be a little careful of grass in your compost, as it may contain weed killer or other lawn treatment products that you dont want in your vege garden. Other than that there is practically no limit to the amount to use. When I started my raised beds several years ago I used about 1/3 compost and 1/3 manure mixed with my soil in raised beds. I am a firm believer in permanent raised beds so that you do not compact the soil. Also you can use fairly dry partly composted leaves as an organic mulch to keep down the weeds and help hold in moisture. I probably add an inch or two every year.

If you have access to that much I'd put a 2-3 in. layer on this falls and another good layer in the spring without hesitation. The biggest problem most of us have is not enough compost. You can never have too much! ;)

Dave