At present (using 11.7 version), the only way to manage logging settings programmatically is to use LOG-MANAGER:LOGGING-LEVEL and LOG-MANAGER:LOG-ENTRY-TYPES methods, which are both set at agent level. 

When, in production environment, we want to set logging at a higher level for debug purposes, we ask a user first to click on a button which activate detailed logging on server side, and then to reproduce his problem.
On the server side, we increase the whole agent logging level. It would be much more convenient for us to be able to manage them at session level (and by this way reduce the amount of activity logs), as we are tracking actions for one session only.