This is a “tiny” but a strong one.
As long as you normally draw, lasso behaves like now.
But if you tap only, lasso will draw straight lines.
Advanced addition but awesome:
Angle snapping steps can be defined same as with line tool but only snaps when straight lines generated by tapping. (Argh, guess this is much harder as I thought as Apple Pencil only gives coordinates when having contact to screen, isn’t it?)
A little video to explain Infinite Painter does lasso function. Tap for straight lines, draw for curves. All with one tool, nothing to change. Super fast and …awesome.