Pay employee expenses outside of the pay run

We've just started using Expenses in QuickBooks for employees, and have immediately had an employee ask to be reimbursed outside of the pay run as they don't want to wait until the end of the month.

I thought I'd seen an article on paying expenses outside of a pay run, but I cannot now find anything on this.

Can this be done (e.g. as a pay run for expenses only, which doesn't affect the normal pay run), or do we need to simply pay them back and then mark that expense somehow so that we don't accidentally pay them again during the actual pay run?