So urecholine only works on the muscarinic receptors. Acetylcholine has effects on either the muscarinic receptors or nicotinic receptors. People are also using acetylcholinesterase inhibitors on PSSD forum to increase acetylcholine. This would increase acetylcholine throughout the body, and not just at muscarinic receptors.
http://www.pssdforum.com/viewtopic.php?f=20&t=2631
Here, a user logs his time with acetylcholinesterase inhibitors and has noticed some success on it.