Description:
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i can understand that you can't use the $SHELL variable, because likely under apache it'll be /sbin/nologin anyway.

however, using always sh can be quite irritating when you're trying to make something and install it on a production environment, when finding out that sh is not the shell you're wanting to have. for a while now we've just changed the sh symlink to the shell we want, but now (for this particular machine) we can't workaround like this.

you can't always workaround by just putting /bin/shell before your command, especially if you're using shell constructs...

interesting would be a exec_shell=/bin/sh variable, which could then be used by the various program execution functions (for me in particular exec)