Selecting a resource in Scheduler and Assignment Manager

When selecting a resource through the Assignment Manger UI (e.g. task owner), one has to double click on the resource and press the OK button.

When selecting a resource through the Scheduler UI (e.g. task assignee), one has to single click on the resource and press the Schedule button. Double clicking is showing the service history for that engineer.

Try and explain that to a user.

Question: is there any way to synchronize the behaviour, i.e. making the double-click select the resource instead of opening the Service History?