beamer \footfullcite multiple references

[Neal Becker]

When using beamer+biblatex, I'd like to have a \footfullcite with multiple
references.  What I get is a single footnote, written like:
citation1 << just imagine this is a superscript
1 In: xyx In pdq

What I'd like is
citation 1,2
1 In: xyz
2 In: pdq

If I try inserting 2 separate citations in sequence
citation 1 citation 2
The formatting in the text is
citation 12
1: In: xyz
2: In: pdq
Which is almost what I want, except the footnotemark says "12", instead of
"1,2"

Any ideas?
Thanks
Neal

-- 
*Those who don't understand recursion are doomed to repeat it*
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