It would be helpful if you could expand the Mileage feature under Time & Expenses to allow a push to either a "Supplier Bill", or, preferably, directly to the Employee Payroll Item as a matching reimbursement field.
Some ideas:
Add a mileage rate field to Employee Contact Cards under Contact Management
Allow a mileage entry under Labour Time Cards without minimum hours
Separate Mileage from Labour Time Cards
Option 1 - direct an approved entry to the employee's paycheque by matching fields in the accounting program
Option 2 - direct an approved entry to Bills (unpaid) in the accounting program
Expand Misc Expense features to allow a push to the accounting program to show as an open bill (by allowing an allocation to Accounts Payable rather than a bank account?)
(in which case problem solved in one go!!!)