My mod has multiple features that make use of list options. For these features, most of the settings are listed under a single collapsible group corresponding to the feature. However, since groups cannot be nested, and list options must be groups, the lists must be outside of the feature's group, separated from the rest of the settings. This makes my config screen look somewhat messy, as it is not clear which feature the list corresponds to.

I think it would be useful to have the ability to nest groups for better organization.