Why can't we change it on the thread itself rather than having to go to "Customise" to do it? I just changed my settings to be able to see all posts and when I updated my tabs (different threads) apart from one the rest had gone "oops, the page cannot be found" or somehing like that.
And the day of the week (to day it is Wednesday) has gone too which is a very clear indicator of the frequency which some threads are answered with.