Nope. You're limited to ellipsis (...) in the actual line.
<shatner>There's..... something on the wing!!</shatner>
"City of Heroes. April 27, 2004 - August 31, 2012. Obliterated not with a weapon of mass destruction, not by an all-powerful supervillain... but by a cold-hearted and cowardly corporate suck-up."
Is there some way to insert a pause in a custom critter/boss's dialog? You've seen it . something like:
That....
Really...
Hurt...........
I'm suspecting it's not possible yet, but it would help make a series of sentences more readable, or for dramatic effect upon death of the boss.