Install the program, then open a Terminal window and type
sudo pkgInstall --deleteInclude a space after "--delete" (i.e "--delete "). DO NOT Press return yet! Next open the /Library/Receipts directory in the finder. Select a package to delete and drag it to the terminal window you typed the command in. You should have a line in the terminal something like
pkgInstall --delete /Library/Receipts/packagename.pkgPress 'return' and the delete process begins; if the package has a delete message you may have to respond to a yes or no question. Repeat for any other package(s) you want to delete.
[Editor's note: I have not tested this myself yet, but it looks like a very useful utility.]

