[Feature Request] Is it possible to fix the end bone position?

[wdw89]

** あなたの機能リクエストはどんな問題に関連していますか？ - Is your feature request related to a problem? Please describe.**
I have a chain with both ends attached to character body. It is rigged with one bone chain, so the root bone and end bone both should have a fixed position attach to character body, But Kawaii can't do it.
あなたのアイデア・提案を説明してください - Describe the solution you'd like
Ability to choose end bone to fixed position.