System Preferences -> Accessibility -> Pointer Control -> Trackpad Options -> Enable dragging. I have it set "without drag lock". This way, a tap+hold allows y

System Preferences -> Accessibility -> Pointer Control -> Trackpad Options -> Enable dragging. I have it set "without drag lock". This way, a tap+hold allows you to drag without pressing on the trackpad, and there's a (very short) period where you can lift your finger, and keep dragging it from the centre or the opposite corner without losing the drag "lock".