No, there's no command currently with 0.2.
Open the Bot.php or PrivGroup.php and under the pgjoin/pgleave, place a sql query to insert 1 for "joined" or 0 for if they leave.
Best place to put the new field is under the members table I think. Field name: "in_group".
Then make a command to get that list, and display the exact people in the group since the bot's last restart.
( Remember to add a line in the bot.php under function connect() to make everyone's "in_group" == 0 )