How to set user preferences for the report builder

I'd like to modify the default settings for the report builder, but I do not know if it is possible to customize. For example, I'd like to:

• Remove the default setting of having the "only show my accounts" filter that's automatically set whenever creating a new report
• Change the default fields that are pulled in when creating a new report
• Modify the Reports Type list to only display reports applicable to our organization, i.e. hide all of the standard objects we don't use