I just noticed a sweet little app on Cydia called TapDial. It allows you to put any number of one-tap quickdials on the springboard for calling particular contacts! And it’s free. (Take that, 1 Click Call and other “legit” non-free App Store apps!)
The only flaw I can see is that there appears to be no way to delete any mistakes. I hope that’ll be fixed in an update soon enough.