[R] R5 multiple inheritance

[Rob Paul Tirrell]

Hi all - 

Is anyone aware of any solutions (or workarounds) for R5 classes that allow multiple inheritance? Alternatively, if anyone has ideas about how where I may be able to start, I'm willing to delve into dark magic. It's presently possible to give multiple superclasses in contains, but method dispatch only behaves correctly for the first of them. I don't *think* this has changed in R2.12.2 - I'm checking into that now.

Regards,
Rob