@bop88 

"Unfortunately, this report doesn't give you the option to categorize all of the income and expenses into categories."

Have you tried running a report just on your bank account(s)?  Go to your Chart of Accounts and click the down arrow to the right of 'View register'.  Click on 'Run report'.  From there you can filter any way you want.  You can include any bank account(s) and just income and expense categories and over any period you want.  It will show you the beginning balance, net change in the account, and ending balance.  

It's a bit confusing because your original question was how to get a report that shows total cash in and total cash out and now you're asking to organize that report by income and expense accounts.  I'm not trying to be difficult but the problem with that is that many transactions affect cash in/cash out and are not items of income or expense.  For example, credit card payments and the principal portion of loan payments are common transactions that reduce your cash but are not expenses.