I have a suggestion: The comparator output of the Corporea Retainer is currently just on (15) or off (0). Instead, the full 0-15 range could be used to indicate the number of items in the request. This would use the same logarithmic progression as the Crystal cube.

I can think of a couple of uses for this information:

1. By comparing the comparator output of the Retainer to that of a Crystal cube it would be possible to only trigger the retainer when (roughly) enough items have been crafted to fulfil the request.

2. In cases where a crafting process is time-consuming, the level of the comparator output could tell you whether it's worth starting multiple crafting processes in parallel.

The current on/off behaviour would still be possible by just putting a repeater after the comparator.