- change players movespeed,equipment, item, state, parameters and skills
and
- change position, zoom and opacity of pictures
You can do all that with normal events. You don't need script calls for that.
For the player move speed, use the Move Route command. Equipment, items and skills all have a special command.
State and parameters I'm unsure. Don't have RMXP on this PC so I can't check.
For changing the pictures, just use the Move Picture event command