Using the ring alarm without contact sensors.

Hi all, Currently, I have a wired alarm system. I do not have a contact sensor on the front door (beacuse of the bevelling on the door, which does not allow for the contact sensor to align correctly) - the entry and exit timers are triggered by a motion sensor in the hallway the front door leads into. The hallway also has the control panel in it. After reading some reviews and tutorials it seems that the motion sensors have a cooldown timer after they have been triggered. My questions are: 1. If I set the alarm using the control panel in the hallway with the entry timer motion sensor in - will the alarm not set until the sensor has reset? 2. The motion sensor in the hall also covers the stairs, if I have an additonal keypad upstairs to set for night mode, can the same entry motion sensor be programmed to activate instantly on Home mode rather than have a delay (which it would need to Away mode). 3. Must you have a contact sensor on the front door to trigger the entry timer? Many thanks for your help.