No, there's no builtin way to do that with ASS, because there's no "inner alignment" option. I can think of a few ways of writing an automation script that produces this effect though.
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17:43:13 <~deculture> Also, TheFluff, you are so fucking slowpoke.jpg that people think we dropped the DVD's.
17:43:16 <~deculture> nice job, fag!
01:04:41 < Plorkyeran> it was annoying to typeset so it should be annoying to read
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