We have a development company that is working with fixed price projects, so my customers do not need to see how much time we spent on an issue. Is it possible to hide all time tracking information for certain project-roles/groups including the information in the activity streams? So far I only succeed in not showing time tracking infformation in the Work Log tab, but the general overview with estimation and time spent stays visible and even worse, the time logging are visible in the activity streams. Thx for any help.