One way to get more characters in the title-field would be to change a line of code, but I don't really recommend it since that might mess up layout and if system is updated the change will be overwritten. But until one of the devs gives a better answer here is one solution.
Make backup of files before changing anything.
Change line 58 (assuming you run lates version) of the file /modules/CRM/Tasks/Tasks_0.php, change the part that says "'cut' => 16" to "'cut' => 32", i.e. you only have to change the numbers. That will give you twice as many characters or try some other number but too many characters will mess up layout.
But you are probably better off waiting for a better solution 😉