Manual Entries for Per Diem and Car Mileage

I use Spark receipts to consolidate all my business travel expenses, that then get submitted to the company I work for. I could not find a way to add expenses like Per Diem or Own Car Mileage. In our company I am entitled to a fixed Per diem for each day I travel. Ideally I would like a separate expense type where I enter number of days and I could define the rates either in the entry form or have them configured in Settings. For example Saudi Arabia = 100 USD per day. Each day should be a separate line item. For Car mileage it would be date, description, total km and rate per km.