The install.R and R_PROFILE.R files

Every usage of these on CRAN is unnecessary. If you want to save the
image, say so in the SaveImage field in DESCRIPTION (but why not
LazyLoad instead?).  If you require methods, say so in Depends in
DESCRIPTION.

I've looked over the packages in the Bioconductor repository and I
believe that every usage of R_PROFILE.R and install.R is also
unnecessary.

(b) A package that requires a saved image (and lazy loading is 
insufficient)?

Many Bioc packages use SaveImage in their DESCRIPTION file.

Could someone provide more detail on the difference between SaveImage
and LazyLoad.  It is possible that LazyLoad would do just as well.

Thanks,

+ seth