Appsaudit "Updates"- > "Check for Updates" already allows for user selective updates while tce-update does all.
So this request must be for the batch command line. Seems reasonable, so I will proceed for 3.2.
Be aware that such list must be used judiciously, as you are possibly preventing your system from being consistent.
Present workarounds are:
1. Remove .md5.txt for those extensions that you do not want updated.
2. Rename your extension, e.g., with a prefix so as to be eligible for an update.