Homescreen changes via iOS Enterprise Remote Device Management
Bingo! you've already got it there in your question.
Your last item &quot;Web clips Credentials and keys&quot; should actually be two - &quot;Web Clips&quot; and &quot;Credentials and Keys&quot; in which case, &quot;Web Clips&quot; is the one you're looking for. A &quot;Web Clip&quot; is a home screen bookmark for a website.
From the Enterprise Deployment Guidelines:

Web Clip Settings
Use this payload to add web clips to the Home screen of the user’s device. Web clips
provide fast access to favorite web pages.
Make sure the URL you enter includes the prefix http:// or https://—this is required
for the web clip to function correctly. For example, to add the online version of
the iPhone User Guide to the Home screen, specify the web clip URL:
http://help.apple.com/iphone/
To add a custom icon, select a graphic file in gif, jpeg, or png format, 59 x 60 pixels in
size. The image is automatically scaled and cropped to fit, and converted to png format
if necessary.