how to remove little lock icon from threads picture

Unlock the thread.

Shawn
After install this mod and check again in http://validator.w3.org/ I got "+53" errors

You may take this into consideration in next release

lol .... sorry i noticed it later that tiny lock is indicating locked threads

Very nice mod.

If you are the thread owner there shouldn't be a small avatar overlay. If you are the thread owner its obvious you posted in the thread and looks ugly when the avatar and the overlayed avatar is the same like inception :)

How can I changes thread icons to be the avatar of the thread laster?

You can't (at least not with this addon).

Would it be possible to give users the ability to disable this by having two styles, one style without the avatars and one with?

You would probably be better off using the $show['hide_thread_avatars'] hook location... then you could just make a per-user toggle if you wanted (for example with a custom user field).

Thank you :)
working fine with me ;)