If your mail server starts creaking under the load generated by your lists, you can use this BBEdit script to convert the AutoShare Mailing List files to digest format.
AutoShare stores user preferences as comments after the user's Name. Like this:
john@domain.name (John Smith..1)
This script simply uses BBEdit's grep command to convert each subscriber's options to noconceal, digest, mail and noack.
If you want to play, the options are:
0 = conceal
1 = digest
2 = nomail
3 = acknowledge
To use, place the script in the BBEdit Scripts folder, open your master list file and select Convert to Digest from the Script menu.
Job Done!
TIP: If you want a list to remain digest only, you can disable the 'set' command for that list. The normal 'set' file in your docs:autoshare folder contains a /=set token which enables the command. Create a new text file called 'set.listname'. Omit the /=set token and subscribers will not be able to change their list options.