Spread hours over a period

Dear sir, madam,

It would be a great help for us if it was possible to 'spread' hours over a period of more than one day. Our people often work on tasks for several day's, but not full-time. Example:

Jim needs to complete task A on 7, 8 and 9th of June. He has 12 hours for this task (4 hours a day). Jim also needs to finish task B on 9 and 10th of June. He has 8 hours for this task (4 hours a day). 

Jim's workload should look like this:

7th: 4 hours booked, 4 hours free

8th: 4 hours booked, 4 hours free

9th: 8 hours booked, 0 hours free. Jim is full for this day.

10th: 4 hours booked, 4 hours free

At this moment, the Wrike planning and workload tool is very limited and doesn't really (I mean not at all, but I'm being polite) work for us. Please take our request seriously since this is a real shortcoming of the software.

Thanks,

Alex