Absolutely, and I've done that before, but the web interface doesn't really help with this. You also need to alert the original thread about it manually so others can follow the thread.
If you have five different suggestions, should that be five separate PRs to their feature branch? Probably? Or they will just need to modify or rebase out the commits they don't want.
Anyway, I just like all solutions where "doing the work" is encouraged over "talking about doing the work." Often, the doing takes less time for both sides.
It would be great to have "PR patches" as something handled gracefully by the web interface. Even if they're just branches under the hood, a "click to accept this change" feature on open PRs would be a nice way to encourage simple fixes.
If you have five different suggestions, should that be five separate PRs to their feature branch? Probably? Or they will just need to modify or rebase out the commits they don't want.
Anyway, I just like all solutions where "doing the work" is encouraged over "talking about doing the work." Often, the doing takes less time for both sides.