I went ahead and merged my pbook records into my main library yesterday, and so far it's okay. For example:
Moderator Notice
Please take a few moments to read our
Posting Guidelines, in particular the part about the maximum image size allowed (600x600 pixels).
Images that violate those guidelines may be deleted.
It is every member's responsibility to read our Posting Guidelines and follow them.
BR
LibraryThing has the concept of a "work", as a metaconcept to associate these records -- have you thought about a better scheme, or a way to implement a "work" concept within Calibre? These are all part of
work 18721 at LT.
(For example, until I happened to look, I had different ratings assigned to the different editions: two 5s and a 4. Obviously, that doesn't make a ton of sense.)
Putting the multiple editions in some sort of structured data within a single custom field in a single record seems the obvious answer -- but that would break a fair number of Calibre concepts in the process.