Default Value Character Limit Increase

[Kylin]

I'm creating an application type of form using Xthreads but have run into a minor issue. The Default Value field (and likely other fields) only has a 255 character limit it seems. I need to increase this to about 1200 for the purposes I'm using this particular custom field for.

Is there a way to accomplish this? I assume the character limit is set in the php files. But the only thing I've found with a 255 limit was in threadfields.php. And after altering it, nothing seemed to change in terms of character limits.