Options are added. Default values for "Too Long" limit (70) and "Too Short" limit (20) can be changed in ACP -> Setup -> Options -> Thread Titles options.
Added "Too Short Titles" submenu that lists threads with title length less than a specified number. So far it is set to "50 - Board title length". I was going from an assumption that thread title should be somewhere between 50 - 70 characters long. But now I can see that totally normal titles are listed as too short. Will be changed in the next update.