Yeah, this is something I can look at adding, for sure.
I'd need some help with it, code-wise. Although the changes I've made to SLX so far might make it look like I'm capable enough of doing pretty much anything, a lot of it has only involved tweaking existing code (or adding old removed code back in). Writing in brand new features is still a little bit beyond me.
I am enjoying learning, though! Plus, the more features I successfully implement, the more I'll want to continue adding in other stuff that people want, so... watch this space

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Thinking about this some more, what do people think of the idea of having more picture/animation-based sound cues (rather than words), in order to further optimise the accessibility potential? Here's an example:
