Developed a configurable application initialization system for the lapce/floem repository, introducing an AppConfig struct to centralize management of settings such as window close behavior and WGPU feature toggles. The work involved refactoring the startup process to consume this configuration, enabling runtime control over application lifecycle options like exit_on_close, which now defaults to true on non-macOS platforms for improved cross-platform user experience. Leveraging Rust and system programming skills, the implementation lays a foundation for safer lifecycle management and future environment-specific feature flags. This approach enhances maintainability and flexibility, supporting more robust application configuration and streamlined cross-platform development workflows.