After several tests with the bookmark, here are my observations.
1) In the Modules tab, the bookmark only displays the name of the sub and link to line code.
2) only one bookmark per sub is displayed in Modules tab even if there are several in a sub
3) a bookmark is indicated for the few sub on which we work frequently.
My wish for a the todo list is meant to remember things to do. The todo tab is a special comment that looks like the log tab by having a part of the text and a direct link to the line of code.
'@todo Make change to this sub to include a wait for