(I've deleted previous posts because my mistake, thank you for
informing me... ashamed)
In my opinion, to include default sounds is the same as to design a
default sound theme.
I don't have plan to do it unless I got an (maybe personally)
acceptable theme.
For example although I gather very nice sounds for navigation event,
I should still consider sounds for windowOpen, windowClose and others.
Maybe some users don't like ie sounds, but need window sounds, they
might not happy if I only simulate ie ones...