Oddly enough, I had this exact same problem on one of my reports. You must have at least one parameter that is not bound to a default value in order to achieve this effect, otherwise it is impossible as you suggested.
The only solution I've come across is to have a single parameter that doesn't automatically have it's default value selected. The user only has to select one value and run the report. I prefer to make this the first parameter so it is consistant for each report, and anything beyond that is custom selections.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.