Starting from V1.80, WebFX features a brand new ARexx interface which will allow you to control WebFX with ARexx scritpts.
This is a quite strange situation: ImageFX will be controlled by WebFX which will be controlled by ARexx scripts :-)
Anyway, here there is the complete list of ARexx commands supported by WebFX:
WebFX Commands
Preferences Commands
CrossFade Commands
Anim2Anim Commands
Pic2Pic Commands
Shadow Commands
Speed Commands
Additional Operators Commands