I had worked with electronic signatures for years, but lawyers have generally chuckled over lay folks focus on signatures. As you rightly say intent is the only thing important.

However your argument about how a court decides if there was intent is also true for traditional hand written signatures.

In http://agree2.com we offer signatures, but only as part of a whole package from drafting, invitation, negotiation, signing and then management. The whole process is recorded, providing a clear audit trail should something ever reach courts.

More important as well than signatures are the contents of what you are signing. Most lawyers I know have never heard of a case where someone questioned a signature.