Auto booting into partition selection

Does anyone know how to have your iMac automatically display the Partition Selection Screen without having to hold down the "option" key? I have the bluetooth keyboard, so when I boot up, I constantly have to keep hitting the power button on the keyboard and re-hold the "option" key to get the Partition Selection Screen.

I would rather it always go straight to the Partition Selection Screen so I can decide which operating system I want and not have to push any keys.

Also, is there any easy way to restart from Windows directly to iOS and vise versa?
"EXAMPLE: Double click "Restart in Mac iOS" icon and it does just that.

Thanks so much for your time and the help!

Install rEFIt. It's a free download but does require some fiddling around in order to get it setup and working to your liking. However, once it's up and running right it's a great boot menu.

Download from here.