Warning when trying to read data from a process step that hasn't happened

I've run into issues where a process errors out or doesn't send an email because I'm trying to read data from a later step in the process to use in an earlier step by accident.  It would be helpful to :

• have a warning that a formula in a User Action or System Action is referencing a later process element
• enable a selection to only display process elements before the process element I am currently editing to:
  • avoid selecting the wrong element for a formula
  • make it quicker to make process element choices