looking for the right hooks

[ULSS]

Hi.. I'm looking for the hooks (if they exist) to add custome links to the areas below. I know I can do it via Template Edits, but would like to use the Plugin System if possible, as it's easier to do upgrades that way.

1. In a post, each user has an Icon next to their name that opens a menu with options like "View Profile", "Send PM", etc... I wish to add a new link to this menu.

2. When viewing a members profile, there are several boxes to the right. "Mini stats", "Friends", "Albums", etc. Is there a way to add a custom box? or to add a links to the Mini Stats box?

3. Is there a way to auto add content to a users signature?

4. Is there a way to add content to the area on a users post where it shows Join Date and Number of posts?

Thanks..