So we have some mixed news here.
Unfortunately you cannot manually enter transactions through any sort of import. You will only get transactions for linked accounts with the exception of Offline Sources. There are no timescales on setting this up at the moment.
If you are wondering how to deal with cash thats not a problem. We have an article on How to handle cash with Money Dashboard. You can also look at the How do I split transactions? page that allows you to see your transactions in a more broken down form if you want.