This should all be possible with our "Marketplace API".  We have different calls:

Publish new item (or edit existing one).  Be sure to use "is-collection" parameter.

Remove item

You can add lots of items using our import tool.  The API is meant for 1 item at a time type requests.

You need a subscription in order to make these API requests.  Cheapest costs about $4/month.

I hope that helps.  

If the collection tracker doesn't do what you need via API, then you can definitely use our pricing data only via API.

This is in process now.  We have a complete list on the site and we are gathering price data now.

The PriceCharting web app does not have a back button, but the browser you use to open the app will have a built in back button.  

Android:

Click the back arrow on the bottom of every app

iPhone:

Starting from just outside the edge of the screen, swipe from left to right to go back, just like swiping the pages of a Kindle book or an iBook.

We don't have a way to delete particular games in bulk.  You can delete your entire collection and add the Wii games only.

Delete collection: https://www.pricecharting.com/delete-collection

Or export your entire collection, delete all the games except Wii from the export file, then import on the Wii games.  This would be the fastest method.

https://www.pricecharting.com/collection-text-importer

Closing.  Duplicate of:

https://pricecharting.userecho.com/communities/1/topics/169-chart-the-historic-prices-for-my-collection

Your comment has been migrated over.  Thank you.

You can do this now.  Just filter your collection by console and you will see the value of all the items for that console and all the individual items for that console too.

Added it now.  https://www.pricecharting.com/game/nintendo-ds/kids-learn-2-think

Prices and photo will show up shortly

This is a PAL exclusive as far as I can tell.  We aren't tracking PAL games for PS4 or Xbox One quite yet.  I'll add this when we do include those.

Emailing is the best option at this point.  I've added you as a beta user for a user editing feature we are working on.  That will be the best option in the future, but it isn't live for everyone yet.

That game image has been changed now.

You can add 1st party accessories and controllers to your collections.  We do not track 3rd party controllers or accessories though.  They are generally not very valuable and there are so many of them from tons of different companies.