Being able to pin modules is nice, but when actively synthing personally I'd find it a nice upgrade to be able to pin as many as I wanted rather than being restricted to just 8 so I don't need to either keep readjusting it or ignore some potentially upgradeable modules as different materials become easier or harder to synth at different tiers. Could add them on a new row once more than one row's worth are pinned, since I understand not wanting to cram more of them into the same row.
I know that might end up cluttered, but I'd consider that a perfectly good tradeoff, and those that don't can treat it like it is now and just not pin more than 8 by choice.