The "BT" in your request likely refers to Bedrock Tweaks or the popular "Actions & Stuff"

Quick actions are UI elements or shortcuts that let users perform frequent tasks with minimal friction. In the context of a texture pack (hereafter BT Texture Pack), quick actions can include toolbar buttons, right‑click context menus, hotkey mappings, and overlay widgets that trigger texture or gameplay-related operations. This paper defines the term, outlines motivations for inclusion in texture packs, and frames the scope: client-side UI/UX enhancements and lightweight scripts that do not alter core game logic.