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The theory of an electronic signature is that some computer code is added to the digital document which comprises the "signature". The added code must not be able to be replicated or altered. This is possible using computer cryptography.
What you can not do is have anyone "witness" such a signature. It is in not way similar to someone making a mark on paper in someone else's presence. Even if you watch someone tapping computer keys you will have no idea if they are "signing" the form or not, or who they are purporting to be when they sign it.
That means you have to redefine how to execute a deed if it is to signed electronically so the "signature" does not need to be witnessed.
The electronic signing facility will require the signatory to have registered with an approved ID certification company, and satisfied that company as to their identity.
For once I do not see how the judiciary could blame a solicitor if a client had electronically signed a document purporting to be someone they were not, once they had been able to register with the ID Certification company. The blame would be with that company.
Run properly the system would be more secure.