I just realised that I haven't seen a post here for Key Plus. I've been using this app since the G3 to map the flashlight to the volume up key, but there's a pretty big list of options that can be mapped to it.
https://forums.androidcentral.com/e...com.apptuners.keyplusapp&hl=en&token=8nUMg0AU
https://forums.androidcentral.com/e...com.apptuners.keyplusapp&hl=en&token=8nUMg0AU