Feature request: Option for non-duplicate keys in split layout

[abb128]

Use Cases

Gboard has an option to remove duplicate keys. This makes it so when there's an odd number of keys in a row, they get biased to the left side. A user asks that we add the same option

Proposal

References

Discord user request https://discord.com/channels/1224276522848751646/1224276522848751649/1427292615279120518