Hiya,
The sqliplugin adds an active scan rule, so you'll need to run the active scan.
The ZAP quick-scan options are farily limited so that probably wont be suitable for you.
This always uses the standard spider, but if your app uses javascript links then you can use the ajax spider as well.
You can automatically install the sqliplugin using the ZAP -addoninstall command line option.
Run the command with -g to generate a configuration file, edit it to just enable the sqliplugin rule and then supply that using the -c option when you re-run it.
Cheers,
Simon