I know there are some ubiquitous shortcuts across most apps and platforms like Ctrl/Cmd S for save.
But I've noticed there is a lot of inconsistency with other common functions. For example, some programs use Ctrl Shift S for 'Save As', while others use Ctrl Alt S (with Shift reserved for 'Save All').
So I'm wondering, is there any consensus on what functions should be mapped to which keys? I see the Shift modifier as an 'apply to all' function, with Alt as 'alternate functionality'. So I prefer Ctrl Alt S for 'Save As' and keep Ctrl Shift for 'Save All', 'Close All', etc.
If there isn't any consensus, should there be?