Shortcut key (DELETE)

So, in version 6, the delete function was mapped to both DEL and CTRL+D  by default. This was very convenient because depending on the type of activity, I found either the right or the left hand to be most useful. Can’t do that in 7. Why?

accidentally pressed alt + d. This deleted mails. This shortcut DID NOT appear anywhere in the shortcut list. Worst thing about it : deleted mails from trash folder without any confirmation.
I assigned the phantom shortcut to another function in the list. So it will not bother me anymore.

Why did this alt + d shortcut not appear in the shortcut list? I see ctrl + d for delete.

I hate these archive, delete, dissapear my mail keyboard combinations. I never use other button than DEL when I need to remove a mail.