I still don't see the point, unless it (accepting non-standard script) is enabled by default. Bitcoin Core already have some option such as changing minrelayfee, but i almost never hear people intentionally change it.
the point would be for a miner to not have to modify the code themselves, instead they just change an option (a variable at runtime similar as mintxrelayfee, addnode, etc.) to accept this particular case which is valid but is being rejected by their mempool.