In the logistics crafting table, my delete key is not working. On the mac keyboard, the delete key is backspace. If I press fn+delete, which does the equivalent of a windows delete key, it does what the windows delete key should - delete chars in front of the cursor.

This did not work for me. I did update to the latest build of Logistics Pipes.
EDIT: Maybe you could ask someone like Chickenbones about what he does for NEI.

A work around that works for me until this is fixed is to right click in the search box to clear it, which is usually faster than backspace would be anyway.

Does anybody know the keycode for the delete key on a mac. I don't own a mac so I can't test it. Without the keycode I don't have a chance to fix that bug. So if anybody knows I would be able to fix this without I can't.

For me, on mac, 51 is backspace, 117 is fn + backspace (delete)

Should now be fixed.