package.el: soft dependencies?

[Yuri D'Elia <wavexx@thregr.org>]

Several packages support additional features when certain other packages
are also installed, but right now the list of additional packages which
are not strict dependencies are "buried" in the commentary.

I know I do the same: I only put strict dependencies in Package-Requires.

I'd love to be able to add and read about "soft" dependencies when
browsing for packages (just like Debian's Suggests).

This could be accomplished with a Package-Suggests header, with exactly
the same format as Package-Requires. package.el would just need to
present this information in the package description page, for the user
to inspect.

What do other people think?