whether the player can react based on user input while following in the waypoint system?

hai to all........i have one small doubt....while using waypoint system whether we can access the player? what my need is my player want to run in a particular path always with based on my user inputs.???? my player runs in via the particular points now i want to give inputs i,e player always use the path system as well as react my input.....give some examples codings or project....Thank in advance