This Uberasm allows you to nerf Yoshi, by removing/restricting his various abilities, and/or by setting a timer that will destroy the Yoshi upon hitting zero. This makes it so that Yoshi's abilities/perks have a cost to them, and forces the player to use their Yoshi more strategically.
The Uberasm has a wide range of customizable effects, which both affect Yoshi's abilities, and the speed the timer decrements, should you choose to set it. Can be used on a per-level basis, or as Game Mode 14.
Uses 2 bytes of freeram as a main timer and a ticker timer.
See the included readme for detailed descriptions and usage of every effect/mechanic.
All of the mentioned abilities appear to work fine, as well as the defines. So, it's accepted. Note that if you have the setting to nuke Yoshi upon level entry, it will kill any placed Yoshis (via Lunar Magic) in the screen you spawn in.