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I think it would be right in your case to use <population> tag. Pls, look at this tutorial . There exist random distribution of positions. Also, you can fix a size, but the size will be common size of N models, which you point in <model_count> tag.

"I'd like to be able to pass the "size" as a parameter to the included object" ---- In case, you want to put models with different size, I guess <population> tag will be not appropriate for that ..