Create Your Own Snap-in Instance List
If the shipped instance list browser will not do exactly what you need then you can always write your own. See Optionally Create Your Own Instance List
When using a snap-in instance list browser, the normal generic instance list layout details (columns, sequence, width, etc) on the "Instance List / Relations" tab have no meaning. You have full control of all these options from within your own snap in browser.
Your snap in browser can visualize the instance list in any way desired (list, grid, tree, etc).
Instance Lists – An Example Snap-In Instance List BrowserThis example snap in instance list browser visualizes a SECTIONS-EMPLOYEES instance list as a 3 level tree.
It's method of displaying the instance list information has been significantly tailored to be different to the way that the standard shipped Instance List Browser presents the information:
Source for Snap-in Instance List Example
Instance List with more than 10 alphanumeric and/or 10 numeric additional columns