In Trello most people type things. Therefore if any of your shortcuts are not using a modifier you are already set up for disaster.
To make matters worse they decided to make "C" Archive. So whenever I misclick CTRL+C for copy guess what happens, you guessed it Trello archives it.
To make matters worse Trello does not let you modify or disable shortcuts. #PureGenius.
Here are the Trello Shortcuts look at how many are standard letters withought modifiers.