How to combine different slot times

Hello,
I have several services that use different slot time (1h for some and 0.30h for the others).
I have set the minimum slot time to 0.30h in the global booking settings, but when I want to book a service that longs 1h, the proposed timing choice is set to chose a starting service every 30mn. This means if somebody book the slot at 8h and another one at 9.30, I’m losing 30mn between 9h and 9.30h because it is not possible to insert a 1h service during this period of time.
Is there a way to propose exactly the time slots depending on the service duration (ie : every hour if the service longs 1h and every 30mn if the service duration is 30mn).
Regards
Pat