I've added TTXT import/export to the todo-list for Aegisub, but that doesn't mean it'll be done any time soon...
Some things I can see is in ASS but not in TTXT: Specifying the border, shadows, arbitrarily rotated text, text scaling, advanced animations and yes, drawings. I'm not sure TTXT/MPEG-4 provides a method for attaching random fonts to the media, meaning you'll have to rely on the fonts installed on the playback system.
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