Make startup manager load by default on startup (rather than option key)

I have a macbook pro 13' (late 2010 version) i am running Lion and i have windows 7 proffesional using boot camp.

When i boot up my mac it loads Lion by default.

I understand that to switch between the two i have to hold the option key on startup, i am then prompted for my password, and after entering it i get to the startup manager which displays the startup disks available.

I would like to know if there is a way of getting my mac to run the startup manager (with password) by default when i boot it, rather than choose one of the installed os.

Thanks in advance.

Gaz