Yes, re-arranging the Robot-interior is on the list. At some point, I'll hire an actual UX person to make it wonderful; in the mean time, you're stuck with just-me reacting to all-y'all's input.

This week, I'm going to experiment with squishing the robot/solder area right a little. And maybe I'll raise the inventory drawer as you suggest. "Or something..."
NOTE: as things get squished/shifted, you might have to drag some of your gates/chips around to maintain neatness. I thought about writing code to proportionately shift things, but decided it was a far better use of my time for you to do it. <G>
I don't currently have any plans to reduce inventory limits*.
I'm told by people
in the know that the smaller drawer grows on you, especially when you see the circuit space opened-up and start to automate inventory-usage, anyway. People who first see v1.0 (or later-beta) won't ever know there was once a longer drawer!

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* Well, at some point, tools & gates drawers will have limits. Maybe. We'll see.