CoreBOSBB

Becouse we need tasks with not only due date but also with end time, we created a new picklist event (for tasks) - so we need to disable standard task module. How to do this?
edit: I mean todo

AFAIK this is not possible. Events and task are an inherent part of the application. I suppose you have tried sharing permissions and profiles but I doubt it can be done.

I mean only to hide tasks in calendar4you - nothing more

You will have to modify the code. Look in CalendarUtils.php, probably functions getActTypeForCalendar or similar

If you do make it, it would be nice if you could share the code, maybe we could implement a generic solution so it can be configurable.

Have a nice weekend