If you flag a post as “Something else”, you can type in more information. It would be handy to have this box when flagging a message as “Off-topic” as well - sometimes useful to make a suggestion as to how the thread should be split.
「いいね!」 2
Just flag as something else in that case, and include text.
「いいね!」 3
これで、入力フィールドを持つカスタムオフルトピックフラグタイプを作成し、デフォルトのフラグを無効にすることができます。
「いいね!」 1