He seems to have no ill effects aside from the occasional moment he decides to use that foot as the dominant foot to climb. But I mean if I can splint it will it heal? If it's worth it I will do it. I mean he is 11 weeks old so it wouldn't be the biggest hassle to hold him down.
If it's been awhile since he broke it I'd say the likely hood of it falling off is low. You'll notice it changing colors if there isn't any circulation and eventually it will fall off though I've never been able to stand watching the process and take them off myself first. If it hasn't healed already you'll probably be fine setting it. If it has, you'll have to break it again to set and risk loosing the toe then. Whatever you decide just watch it for loss of circulation or infection. Loss of a toe isn't a major issue for a chicken so it really just depends on what you feel is best for him.