[RPG] Would changing world scale have unintended consequences

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Context

I've started planning for my Christmas one shot, I had the idea of playing a toybox adventure (think toy-story or nutcracker) with custom races for each type of toy and using giant stats for humans. They PCs will be toy races with potential for human sized enemies. My issue is that a 5ft scale would be illogical for this world. I thought I had three options:

  • Ignore the logic and just pretend everything is scaled up.
  • Alter the scale of the world to fit with the setting
  • Keep everything the same and make the PCs size tiny or diminutive

I'll be running the one-shot with 5-7 players at level 3.

Question

Would reducing the scale from 5ft to 1ft (or other measurement) have any additional undesired effects?

I've already factored in scaling down range and everything else, basically just divide every measurement by 5 and I wanted a sanity check that this wouldn't cause any issue I hadn't considered.

Best Answer

Don't change the number, change the units

Instead of it being 5ft squares, call them 5 inch squares, continue with the rest of the game as normal safe in the knowledge that everything is exactly the same and there are no balance concerns not inherent in the system.

Or if inches aren't quite right invent some fantasy measurement which is around a fifth of a foot and then go on from there.