IT HR and Barbie made some very valid points. For some reason, this is sending a flag off for me. I would seek employment law counsel in your area also. I think it also depends on how controlled your electronic procedure would be and how well you could prove that the document could not be changed after the signature. At a disciplinary meeting, you already will have a disgruntled employee. I also thought about what happens if they refuse to "sign" the acknowledgement? What happens if they disagree with it?
I am all for electronic signatures on things like W-4s, benefit enrollment forms, etc. But in this case, like I said, my radar is going off. I would have to think long and hard before implementing it.