There is a feature introduced in 12.2x code Configuration Change Notification and Logging where it allows to record all commands entered in configuration mode that can also be sent to syslog server as well, this feature works great, any command entered in config mode will be recorded saved in router archive defined buffer as well as sent to syslog server.
http://www.cisco.com/en/US/docs/ios/fundamentals/configuration/guide/cf_config-logger.html
Basic configuration is simple
e.i
archive
log config
logging enable
logging size 50
notify syslog
hidekeys
Check Cisco feature navigator in the event your IOS does not have that feature and inquiry for your platform type, or see more details in above link given Table 1 Feature Information for Configuration Change Notification and Logging for detailed IOS codes supported.
http://tools.cisco.com/ITDIT/CFN/
Rgds
-Jorge
Jorge Rodriguez
