John,
This same question was asked of Mike Phillips (GM of Lionel) during the LCCA convention. His response was to send the information to TalkToUS@LIONEL.COM They have set up a clearing house to monitor the emails for the Cab3 (and controls) related questions, etc. From what I understand, these are collected and responded to as appropriate, with any new issues/finding that may be of general interested posted on their dedicated controls related website - https://control.lionel.com
I just went to their new site. There is lots of information there.