Plug-in that acts like content page

Not sure about plugins (personally). We're using Custom Pages to take care of that.

1. Navigate to the Group/SubGroup you'd like to add the page to.
2. Manage Themes > Manage Pages
3. Add the new Custom Page
   1. name the page
   2. enter the URL Key you want to use (simple name of page)
   3. save
4. Navigate to the Custom Page you've added.
5. Add widgets.

Right. I basically want to define a route in a plug-in and be able to save each like a content page- give the illusion of a site hierarchy that doesn’t exist

Sounds like you want to only do this from the plugin side, cool... Routed Pages seem to be the answer for you: https://community.telligent.com/community/10/w/developer-training/53231/page-definition-and-url-routing#Routed_Pages_vs_Custom_Pages 

Kind of. One route that can handle many pages with different layouts 

Right, that's why we're using a bunch of Custom Pages under a sub-group. Works great. I'm too new to explain details on Routed Pages so I'll leave that to the community, best of luck.

My train of thought is now thinking an INavigable Plug-in that registers routes dynamically from sort configuration or XML file. Question would be when does the route table get refreshed?

Its 1 set of widgets, 1 layout per route, so you are not going to be able to have dynamic layouts.   If you want different layouts or widgets, it will need to be separate pages/routes.

Note that you can have dynamic values in your route, but the layout tied to it is static.

The routes get refreshed like standard route tables, when the app restarts and plugins reload.  

Thanks Patrick M. - would enabling/disabling the plugin cause the routes to reload?

It should, there is a bug for application routes I think was just fixed, but standard INavigable should be fine

Thanks Patrick.

Context:  We are investigating moving most of our website over to Telligent.  Management would like to have the same URL structure.  So plan is to have a Plugin that implements INavigable and possibly some sort of multi-line String configuration that takes in XML which would basically define  custom routes.

In the RegisterRoutes method, plugin would read that XML, parse it and loop through it and register a custom route for each node, thus letting us add a custom route by updating plugin config XML field...

Routes would basically look like:
/category/pagename