[R] Scale package change comma defaults?

[John Kane]

I was using the comma() funtion in the scales page and was wondering how to chage a  the defaults.  comm(1000) gives me 1,000 which is what I usually want but how would I change the output to 1.000.  

I had thought that I could simply do
comm(1000, big.mark = ".")
but I am getting 
Error in format.default(x, ..., big.mark = ",", scientific = FALSE, trim = TRUE) : 
  formal argument "big.mark" matched by multiple actual arguments

And since I'm here I might as well ask if there is a way to keep a couple fo decemal points rather than rounding to the first integer.

Thanks
John Kane
Kingston ON Canada

sessionInfo()
R version 3.0.1 (2013-05-16)
Platform: i686-pc-linux-gnu (32-bit)

locale:
 [1] LC_CTYPE=en_CA.UTF-8       LC_NUMERIC=C               LC_TIME=en_CA.UTF-8       
 [4] LC_COLLATE=en_CA.UTF-8     LC_MONETARY=en_CA.UTF-8    LC_MESSAGES=en_CA.UTF-8   
 [7] LC_PAPER=C                 LC_NAME=C                  LC_ADDRESS=C              
[10] LC_TELEPHONE=C             LC_MEASUREMENT=en_CA.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] scales_0.2.3

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