[foldr]

>I have always found strange things to happen when my held down finger (on the "virtual button") moves too much

All that happens is that the item you're dragging makes a corresponding movement.

[slantyyz]

Yes, but when you're trying to position something precisely, that's a problem. This doesn't happen when you have a physical button that only has an on/off state.

Keep in mind, I hate trackpads because I'm generally clumsy with them. That's just how I am. I get that it's not an issue for other people who have better hand-eye coordination.