Yeah. The purpose of having 10 pages isn't usually storage size, so much as the ability to bump old threads. When a thread gets down to page 10 with no one bumping it, it's generally assumed to not be worth keeping (or so large that it'd be better to just make a new thread). With text boards like /lit/, it should be fine to increase it to 15.
We were planning on creating an archive so this wouldn't be an issue (like the old GUROchan had), but our PHP dev died. I'll work on it when I have time but PHP is not my specialty so I'll be slower at it.