Sony Reader: Can I prevent creation of single-item collections?

[trekchick]

I love that Calibre can automagically create collections based on Series and sort the items in series index order on my device. But... I don't like that I have a few dozen collections containing only one item. Is there a way to set a threshold for minimum number of items in a collection? I know this is configurable in the fabulous Kindle Collections plug-in, and I'm looking for a similar result for my Sony.

If I could figure out how to count the books in each series that are tagged _onsony, I'd put that calculation in a column and I think the rest would be relatively straightforward. However, I suspect there is a more elegant solution that my perambulating thoughts have completely missed.

Any nudges in the right direction will be appreciated.

[speakingtohe]

If you sort by popularity with the alter tag browser button and ctl-click on each with one author you could populate a column fairly easily.

Helen