have a property on the plugin that contains the style info, so that people can configure another style, see this for an example of what I mean: 

https://github.com/opengeo/gxp/blob/master/src/script/plugins/FeatureManager.js#L147:L151
https://github.com/opengeo/gxp/blob/master/src/script/plugins/FeatureManager.js#L388:L389