Fascinating data point for the UP Needed More Love collection.

I bet it would have gotten caught and tweaked if we had some way of suggesting (or at least knowing which) resolutions for the next UP 'event.'

It's funny, the OP mentions this resolution, which in 40+ games I've never seen, and as soon as he does, it show up in my current game.  It's also like the alighnment change event: hadn't seen it before and now it is coming up in back to back games for me.

Could be.  Dungeon Keeper did this.  Certain bonus levels could only be accessed on a date with a full moon.

I suppose you could add "Transport Modules as Weapons" to this list.  Not sure if it would be a price/space savings, but you could get the UP resolution for transports to get 5 in each weapon category.

Add to that, the constructor modules' cost is 80 and the size is 35. How many engines could you add within those costs and sizes?

The size of the Impulse drive is your limiting factor. You could probably fit 3 of them because of the SizeMod, while still keeping it within the size of the Constructor Module. Given a speed of 2, and the hull having at least a speed of 1, 3 Impulse drives would give you 7 speed at a much lower cost - 24 vs. 80.

If you go up in engine techs, the gap widens even further with both the cost and size.

It makes no sense to use a Constructor Module as an engine, no matter how many you can add. Adding more than 1 just makes things worse. And as it has already been pointed out, there can be only one. And that one is, no brainer, a bad choice to make.