The number of posts displayed is based on configuration settings (Maximum Displayed Posts Before Page Split and User-Settable Maximum Displayed Posts) in the ACP -> Thread Display Options.
In theory you could allow the user to select a ridiculously high number like 1000 or some such simply by adding it to the list in User-Settable Maximum Displayed Posts. It's very easy to change and give it a try. However this could have a significant performance impact if you have busy forum and a lot of large threads.
If you do change it to try it out you then need to go into your User CP -> Edit Profile and select the number in Number of Posts to Show Per Page.
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