Hi
If Toxik supports command-line based renders, you should be able to submit such job using the command-line or command-range jobtypes. Documentation on the command-line and command-range jobtypes, and "qbsub" to send such jobs, can be found in the User Manual.
Also, you may be interested in utilizing qubegui's simpleCmd framework. Please consult the Development.pdf documentation for simpleCmd. There are also some READMEs in the source folder.