We do a similar kind of Tracking on Month-to-month basis, actually the repost is given by the Security person, which is for all the users, and then as per the User Group for all the plants we can check as which T-Code is used by which person How many no of times, by converting the same report in the Pivit Table and Chart, the IT department take the Decission as from which all user , which T-Codes needs to be removed, and if the New T-Code is assigned then the requirement comes from Business.
I guess a Similar Report can be used by you also to check out as of which all users are using which T-Codes and that can serve your Purpose and check out for the Descipline in the users, but how can you judge on the day-to-day basis, I guess it will be helpfull if you can take a longet Period of time like monthly or atleaset Weekly.
Hope it helps you.
I guess the Best person to help you in that case will be your Security Person, Just ask him for the report for all the T-Codes Used and the No. of times the T-Codes used by each user(maintenance User-by User Grp) for a week, he can give you the complete detail for the same.
This report should be run weekly once. now you can do the analysis for the same.
Hope it helps you further.
As Mr Yawar khan has said you need provide the list of Tcodes i.e. IW31/IW32, IW21/IW22, IK11 etc to BASIS team & ask them to take the report for no of users accessed these transactions. From this you will get an idea of who is accessing which T codes & how many times.