I don't use any one finger, or short cut methods like Yamaha and Korg offer, or even intelligent chord like Roland uses..
Mostly I play piano mode where Roland needs to use 3 or more notes to read chords .. and on the BK9, with hold pedal needs 5 or more notes to change chord recognition..
I always use bass inversion too..
This method always insures me that I will get the intended chord... I have no problem playing full chords with either hand or both hands.. This is the most natural way as a player..
If I am going to use another sound besides Piano and EP or guitar, I will split the keyboard and play actual chords with my left hand... right hand will be sax or any other mono instrument .