I could never get more than one kid at a time to work in VV2, but VV1 it worked for me on the mushrooms, I think I got about 25 kids all on one of the higher count mushrooms one time.
I'll have to try and see if I can get it to work in VV3 now, I figured it wasn't possible since they fixed that in VV2.
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YAY! -- I tried it a few times and it does work but you have to be really fast to get more than 2 kids. Be careful that you don't drop the first kid ON the item accidentally if you've paused, it won't work it that case.