Custom token sets: multiple tokens from one PHP function

Would it be possible to allow for the creation of multiple tokens from one function -- as in, by returning an array with the token as the key and the token value as the array value? If I understand the module directly, this would allow for users to set variable numbers of token values, in particular when retrieving tokens from a referenced node/user (which may not always have the exact same fields).

This sounds confusing, but for a use case, please see:
#483156-13: Tokens for CCK fields within a node reference

And give a shout-out if this feature would be useful to you too! It might get me digging into it quicker if I get the A-OK that it sounds do-able :)