Good to think about though. I read somewhere that the compost should be at least 1 cubic meter to have any chance of reaching a high enough temperature; my garden compost is at least that big. But I do still refrain from adding diseased things, or invasive plants.

When I thin my plants it tends to be because I've planted too many seeds at once for example. A lot of the times I separate them instead, but I don't need that many plants to risk separation.