When you say "electronic signature" do you mean, literally, signing on an electronic device like Best Buy uses at checkour or like UPS uses when they have you sign for a pacakge?
We use a biometric clock and then run a pre-submission report showing payroll breakdown (hours, commission, bonus, etc.) gross and net and they sign that the old fashioned way.
When we went from in-house time clock, paper, pen, and calculator to outsourced payroll with biometric clock, we went from 3 people working 3 days on payroll and tying up the accounting software for a couple hours to 1 person getting payroll done in 1 day.