Maybe I'm not seeing this properly, do you mean the issue of /$foo/ where $foo is a string? If so, its not clear to me how changing that makes the issue of rebinding compiled code into the pad of its usage context any easier.

I can see how changing how variable interpolation is handled in regexes would make for a lot more flexibility in other respects, but its not clear how it helps the immediate issue of this thread... Can you explain a bit more please?