Also would like to customise Error Pages as well so I can insert application Insights code to track problems that users are experiencing.
Thanks for your feedback! Your idea sounds interesting, but we need more information:
We are certainly thinking about extensible user schema across Office365 suite, and trying to figure out which attribute mappings make sense. We’d love to know more about the scenario you have – Why did your customer chose to use AD custom attributes over User Profile attributes in SharePoint?
Mobile number is another property we would like, IT would like to control this value since they setup and provision the phones and re-allocate them.
Yes agree OTB feature would be very useful, we have a custom AD attribute "Desk Location" and we would like the Internal IT department to manage this property value, and then have it sync up to SharePointOnline.
4,565 votesworking on it · AdminBarbara Feldon (Office 365 Customer Experience, Microsoft Office 365) responded
Great news! This capability is included in in the recently updated Office 365 Roadmap entry: “Admin App Launcher Customization Tools” which can be found in the “In Development” section.
Agree, very useful feature.