No — at this time, WCPI pools on STON.fi (like all other pool types) consist of two assets. Users cannot create pools that contain 3, 4, or more tokens simultaneously.
The distinctive feature of WCPI is the ability to use custom weights between the two assets in a pool (for example, 80/20 instead of 50/50), not multi-token support. That weighting flexibility is what makes WCPI useful for risk control and exposure strategies.