[R-sig-ME] Force the random effects variances to be the same

[piuo244 m@iii@g oii @ucki@@du@i@@c@@z]

Hi,
I would like to use lme4::glmer to fit a model of the form
y ~ x + (0+m|group) + (0+f|group)

where a group looks like 
m f1 00 11/2 1/21/2 1/2
1/2 1/2

I was wondering if it is possible to force the variances of the random effects to be the same?
Many thanks,Zoe 
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