R help - Sep 2011 - heatmap.2 with colsep and sepwidth

I am using attributes colsep and sepwidth from heatmap.2 function, 
however when using larger values for sepwidth the following columns are 
not moved to the right but the seperator is covering the column(s) with 
a white bar and the column labels and ColSideColors remain at their 
positions, is this intended? I expected the following columns to be 
shifted to the right by sepwidth. Is there a way to achieve this?

Here is a simple example

library(gplots)

col <- c( rgb(0,100:0,0,maxColorValue=100), 
rgb(0:100,0,0,maxColorValue=100) )

heatmap.2(matrix(c(1,2,3,4,9,6,7,3), nrow=2), col=col, trace="none", 
density.info="density", key=FALSE, ColSideColors=rep("blue",
4),
denscol="white", scale="row", dendrogram="none",
colsep=c(2), sepwidth=1.8)


Regards,
Christian