Today Dean brought up my old post here https://www.ecommercetemplates.com/support/topic.asp?TOPIC_ID=108961 where we have some custom buttons on the order details page in the admin.
This got me thinking how nice it would be to have a few places in the ect native code where, if additional content (mods) exist, they would show. Much like the ability to create and edit the custom admin css file, there could be a few strategically placed bits of code that call up an empty include file.
Developers can write mods around these include files.

For my tip that is linked above, it would be great if there was one of these includes near the bottom of the order details page so any additional features such as my custom print/edit buttons would show there when the code was added to that otherwise empty custom include file.
This is also the spot where servelinks "client upload mod" files are shown.
My google maps trick would fit there as well.