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alpha support in raster function 'KML'?

Hello,
Does the 'KML' function from the raster package support an alpha channel?
The .kml file output via the code below suggests it does not, but I was hoping for confirmation.
Thanks kindly.
Dave.

#__________________________________________________________
library(raster)
r <- raster(nrows=108, ncols=21, xmn=0, xmx=10)
r[]<-rep(1:10,1000)[1:ncell(r)]
t.colors <- colorRampPalette(colors = c('yellow','orange','red'),alpha=F)(10)
t.colors <- paste(t.colors,c('1A','33','4D','73','8C','99','B3','CC','E6','FF'),sep='')
KML(r, filename='c:/test/test.kml', blur = 3, col = t.colors, overwrite=T)
#__________________________________________________________

#salient sessionInfo()
#R version 3.1.3 (2015-03-09)
#Platform: x86_64-w64-mingw32/x64 (64-bit)
#Running under: Windows 7 x64 (build 7601) Service Pack 1
#other attached packages:
#[1] dismo_1.0-12    plotKML_0.5-0   twostageRSF_1.1 debug_1.3.1     rgdal_0.9-2     raster_2.3-33   sp_1.0-17


__________________________________
Dave Gregovich
Research Analyst
Alaska Department of Fish and Game
Wildlife Conservation Division
Douglas, AK 99821
(907) 465-4291
dave.gregovich at alaska.gov
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