Wipe-Out sector: (Force Banana-Peel effect, for oil slicks and anything else)
Linedef Type 434, "Award Custom Power".
You'll need two executes tied to the same tag.
For one, ACP's X-length needs to be 57; this is the pw_ number for the spin-out.
Y-Length is how long to spin out for, default in-game banana length is 275.
Second one's ACP X-length needs to be 68, with a Y-Length of 3. This tells the thing to actually initiate the spin-out.
Also, be sure to set both execution linedefs to "Each Time", or else anyone hitting the wipe-out sector'll spin indefinitely within the sector.
(The Banana Peel sfx is automatic, so you don't need a Play-SFX executor)
EDIT: Next release version will fix the current problem wherein star and megashroom can still slip on a wipe-out sector.