[taintballs69]

No. That is for the host/domain entirely not a specific stream.

I might want several directories in the future, and even if I don't, I might want it separate from my .well-known robots.txt. Many, many reasons I can think of not to blend these.

Bad idea.

[pavon]

The current design has the same limitation of applying to the domain as a whole, but has potential name clashes that .wellknown would avoid.