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Yes, some sort of deblocking in the decoder could go a long way, e.g.

This isn't something that can be done on the encoding side, so it's out of scope of MozJPEG.

I do think it may be worthwhile to spec a backwards-compatible extension for decoders that adds deblocking.

You could also just modulate the lambda used in the trellis quantization so that it is less aggressive in smooth blocks, and more aggressive in textured blocks. It's not as good as being able to change the quantizer, but you can get somewhere around half the benefits of real activity masking by changing lambda alone.

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