There is an issue to provide platform specific
shorcuts. The problem is visible on MAC
especially. On MAC are actions typically mapped to
Meta-<something> instead of Ctrl-<something>.

Current implementation of "Shortcuts" folder
doesn't allow the platform specific declarations.
I guess the main problem of current solution is
that the shortcut is encoded into file name in the
layer.

I.e. current shortcut declaration is like this:

<file name="C-X.instance">
    <attr name="instanceClass"
stringvalue="someAction" />
</file>

-----------------------------------

For our purpose we created a hack whic looks like
this:

<file name="C-X.instance">
    <attr name="instanceClass"
stringvalue="someAction" />
    <attr name="shortcutMAC" stringvalue="M-X"/>
</file>

The value of attr shortcutMAC is then used instead
  of the name when running on MAC. 
But this solution is not 100%, and cannot be
applied to NB (When user tries to create the C-X
binding, it won't be saved, because the name is
already used [and interpretted other way]).

------------------------------------------------

Suggestions to possible solutions.

1) Dont use the shortcut encoding as a file name,
rather put the platform specific shortcut
encodings as the attributes, there could be used
default shortcut too:

<file name="someShortcut.instance">
    <attr name="instanceClass"
stringvalue="someAction" />
    <attr name="shortcutDefault" stringvalue="C-X"/>
    <attr name="shortcutMAC" stringvalue="M-X"/>
</file>

And then act accordingly to the platform, picking
up correct attribute and creating desired binding.
This requires to update the handling of the
"Shortcuts" folder.


2) Or another solution is to create subfolders
with platform specific shortcuts in "Shortcuts"
folder.

-----------------------

Those are just suggestions, I'd like probably the
solution 1). But you can come up certainly with
other solutions.