IF... you could manage to get the dot on the subject which would be as hard or harder than almost centering in your viewfinder you would then have a red dot in your pic that needed removing.
If your subject is in flight or sparse branches the dot won't appear until it hits either the bird or surrounding branches,it would be very hard to find the dot let alone put it on your subject especially in flight with nothing around it.
Patience,time and practice sprinkled with some luck is the best way I think.
Besides if ya hit one of those birds in flight in the eye with the laser it's liable to crash into something...
Pentax 18-55mm,Pentax 50-200mm,Sigma 17-70mm,Sigma 70-300mm, Sigma 50-500mm