So far the best alternative I've found to my question is using the Task List Window. It's also possible to add new XML tokens and sort references by topics. Overall it greatly helps even though I hoped there was a better solution to this problem.
Task lists can be sorted alphabetically by their description, so it's possible to create some kind of table of content by using numerals while adding XML comments with the appropriate token. Note that new tokens can be added from the IDE options. In Sharp Develop, Tools > Options > General > Task List
Example:
In the source code:
// MY_TOKEN: 01 - Start of foo behavior
Later in the code or another file
// MY_TOKEN: 02 - More stuff related to foo behavior
Later in the code (or another file
// MY_TOKEN: 03 - More stuff related to foo behavior
Et cetera.
It looks like this in the IDE:
Therefore from the Task List Window it's possible to quickly jump to the references.
Is someone has a better solution?