As a plugin developer, in order to provide great auto-completion hints for lengthy methods, I need the completion menu to be wider.
Just making the maximum width much wider is all that is needed to make completion much more useful with plugins like the one I am developing. The current max width is too narrow, so that many completions get truncated to the point of uselessness.
Hope this screenshot below demonstrates the need (see the bottom few completions in the menu).
Forum thread: http://www.sublimetext.com/forum/viewtopic.php?f=4&t=4071