Because nControl hooks into the core iOS Bluetooth framework, it can conflict with other Bluetooth-reliant tweaks. If your system settings application freezes when selecting a controller, boot your device into a "Safe Mode" state via your jailbreak environment, remove conflicting wireless adjustments, and reinstall the core nControl deb package.
No. The original distribution source (Packix) has shut down, and the developer has not migrated the tweak to any other paid repository. ncontrol deb link
nControl (com.nito.ncontrol) status for iOS 12? : r/jailbreak Because nControl hooks into the core iOS Bluetooth