Here is the forum-thread I found this editor. (V1.3)
Supported Games:

1. Mega Man X (U) (V1.0)
2. Mega Man X 2 (U) [!]
3. Mega Man X 3 (U) [!]

Here a github-page with a earlier version. (V1.0)

I know very little about it but did think it is worth sharing here. Please let me know if you find a nice guide on the tool!
Here the docs shared on the github along some notes on events and how to use the editor. (here is some documentation on a similar editor..)

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