I am using a HTC Touch Cruise. When reading web pages, the wheel button is for scroll up and down the page. I hope there could be a setting place to control the scroll amount for each action. Because at the moment it always go up/down a whole page. I just found it's a little hard to connect with the contents on the previous page. I don't know how other phones handle this problem. If we can set how many lines to scroll will be good. I think even include the last line of the previous page in the view when a pageup/pagedown happens will help a lot.
And another minor thing is: if the application can mark themself as a reading/editing program and keep the backlight on will be great. Similar with the behaviour of Media Player in desktop pc's overrides the screen saver settings. And make that configurable too.
Option to set scroll amount in Browser and other reading applications
