I use the piano sound quite a bit and rarely use the sustain pedal. I use the technique one would use playing an organ, which I am more of than a pianist.

An organist has to learn how to sound smooth without a sustain pedal. This means kind of crawling with your fingers. Let's say you play 2 or 3 notes with your right hand and then you need to move up, you move one or more fingers over to play some of the same notes as you are moving to play the next series of notes etc, etc.

This is kind of hard to explain in words, but, if you put on an organ sound and just using the right hand try and play harmony with melody on top with your 4th and 5th finger, fill in chord notes with the remaining fingers, make it sound as smooth as you can and you will see what it takes to play this way.

I have just transferred this technique to arranger keyboard. This is the compromise I have made since I play the keyboard like an organ as my preferred way. I like to use all the different sounds and be able to change them quickly, so full keyboard is not my first choice.