对于命令系统来说，给execute添加几个判断，和几个新指令是很好的选择，有助于数据包的开发（并且会提高可移植性）。

1. 获取某位玩家当前的胶兽形态
2. 允许untf/untransfur指令的参数为空，这种情况下默认为执行者
3. progresstransfur指令中，胶兽形态放在最后并作为可选值（留空则选择上一次被兽化攻击时的类型），放在胶兽形态之前。此外，允许负值以便退兽化进度，（可能破坏向后兼容性）
4. 有时需要全部对选定的玩家进行群体兽化/解除，/untf（或untransfur）、/transfur（或/tf）、/progresstransfur允许多玩家实体选择。
5. 在execute中，if/unless允许 判断某个玩家是否是某个胶兽形态
6. 允许通过特定指令，使得胶兽玩家强制抓住某个人形生物（可不实现）
   还有其他想法（会在评论中一一补充）

For the command system, adding a few conditions to execute and introducing a few new commands would be a great choice, which would aid in the development of datapacks (and enhance portability).

• 1. Retrieve the current slime form of a specific player.
• 2. Allow the untf/untransfur command to have an empty parameter, in which case it defaults to the executor.
• 3. In the progresstransfur command, place the slime form at the end as an optional value (if left blank, it selects the type from the last time the player was attacked by a beast), with <progression> placed before the slime form. Additionally, <progression> allows negative values to regress the transformation progress. (may break backward compatibility)
• 4. Sometimes it is necessary to mass-transform/untransform selected players, /untf (or untransfur), /transfur (or /tf), /progresstransfur should allow for multi-player entity selection.
• 5. In execute, if/unless should allow checking if a player is in a specific slime form.
• 6. Allow a specific command to force a slime player to grab a humanoid creature (implementation not required).

Other ideas will be supplemented one by one in the comments.

In the progresstransfur command, place the slime form at the end as an optional value (if left blank, it selects the type from the last time the player was attacked by a beast), with placed before the slime form.

This is no longer possible, the last attacking variant is not tracked.

只要可以省略匹配对象就足够了，默认执行对象为命令执行者。 但有一说一，/transfur的形态命名空间是有点不方便（指form_前缀的存在导致无法快速打出首字母直接Tab一下）
It is enough to omit the matching object, 和 the default execution object is the command executor. But one thing to say, the form namespaces are a bit inconvenient for executing commands (referring to the presence of form_ prefix that can't quickly type out the initial letter and then tab it).