I don't know of any pending improvements to graphic.js, but it certainly is like most things in Synchronet, up for change as wanted or needed. If you feel like adding additional ANSI sequence support to graphic.js and submitting a PR, it'd likely be merged into master.
I believe the ANS->MSG conversion that happens within would make this challenging, at least in my use case, since I don't think you can do 256 colors with CTRL-A codes (can you?).
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