Allow modpack developers to choose the default Java version and JVM options for their modpacks (for example, Java 21 or ZGC). This ensures modpacks run with optimal performance, take advantage of new Java features, and avoid crashes or slowdowns, without requiring users to manually adjust JVM settings every time they launch the game (Most ignore it, and debugging sometimes becomes a nightmare). It simplifies setup, improves stability, and makes the modpack experience smoother for everyone rather making people MANUALLY add it EVERY TIME