I'd go for the plugin, but it;s up to you.
To alter a generator config is easy:
- copy the .config file you want to edit, for example <llblgenpro install folder>\task performers\AdapterScenarioFullSafe2003.config, and copy it in the same folder, give it another name
- open the copy in a texteditor (it's XML), and alter the <name> tag's contents so you'll recognize it in LLBLGen Pro
- add a task to an existing taskgroup, for example by copying an existing one.
The SDK documentation (customer area -> extras section) contains documentation about the structure of these config files and the meaning of the XML tags, for example section "Generator configurations, XML structure".
If you get stuck, please let me know.