Hi mate,
I would like to give you the answer:
1 - You can add more modules in Layout control > select Category page (displayLeftcolumn) to configure.
2 - With this issue, My coder will help you to check in code. Please provide me your FTP account.
3, 5 - When I checked this issues in the demo site, I can see that all these parameters are fixed in the code. So this is the default style of this theme. If you want to change as your idea, you can customize by yourself or contact to our customized service. The admin there will help you to check and solve them as you wish.
4 - This will be updated in the near future. If you can customize in code, you can do by yourself. If not, you can wait for the next update version in the future or contact to customized service to get the quick support.
Regards,
Yame