I have been testing the problems you have about the logo, gallery, owl carousel and others but unfortunately I have not been able to confirm them. Those issues have to do with the particular Octobercms installation. All upload methods are based on native Octobercms upload method using mediafinder fields, so the path issues has nothing to do with theme. But if you can't find any solution to this issue i will try to help you. You can give me credentials to take a look.
For the customization of the colors in the "custom" option, some options are given to change some colors with ease. Changing Primary and Secondary colors will give you the basic colors of theme to your own style. If you need any extra customization just inform me and i will try to add it. If you believe that some options need to be changed to work in better way just let me know.
This theme is not made to be used as a One Page Theme, you have to do some custom work to make it happen. If you have problems i can help you with that.
This theme is a client friendly theme that gives you the tools to create a custom website using ready made sections with custom fields. If you need any help you can always ask me and i will do my best.