adding another parameter when posting

[Lynne]

You'll want to use the datamangers there. You can read up on datamanagers in the articles forum. Basically, first you need to add the fields to the $validfields array (again, search the files to find it - hint, check the beginning of vB_DataManager_Thread for a hook - threaddata_start), and then you will have to set each of the fields prior to them being saved in the datamanager.

I would strongly suggest finding some modification here that is similar to what you want and looking to see how they did this.