That was my plan as well, but I was told that you sometimes need to push a button and turn an encoder at the same time. It would also be really easy to turn a knob and change a parameter accidentally when trying to push the button.
Just read down a few messages either here or in the supplies section, and you should see the post from me. I just asked a few days ago.
I thought of that myself before I got my first encoder with integrated button. After few turns and pushes I left that idea. It is OK to use that button only if you must, because of the very limited space and in some other applications but not sequencer. For 2U rack, better go with smaller, separate buttons than integrated. 2U rack is not so small. Here is the good example of PayC`s beautiful sequencer…