You can use OSTicket with wordpress, I have done it before. There is a plugin you can download that is available, not sure if it's updated for v1.10 OSTicket, and any issue with that will need to be addressed with the person/team who made the plugin. I would strongly advise that any modification that you do to your installation should be well documented in the case of upgrading, you will loose all modifications if you upgrade as you are replacing source files with newer updated versions.