any mothers on ET who have found a pay penalty and other gender inequalities

Yes (ingrained sexism and racism everywhere discounts  opportunity and compensation)

penalty and other gender inequalities have affected their choices and careers

and no: I've "always" known myself to be better suited --terms of skill and temperament or high-risk threshold-- to self-employment. I value self-directed time management more than other forms of labor compensation.

Recommendation #3, "Create substantially more part-time work in higher paid occupations," addresses the principal economic benefit of self-employment, regardless of gender status or types of nonpaying custodial duties in my experience.

So I would say, my path of career(s) and earnings development is not derived from parenting obligations. Rather parenting obligations reinforce pre-existing conditions of employment that reflected my high opinion of my time :) and low opinion of luxury goods and "wealth" acquisition.

The likelihoood of the gap closing between mandatory minimum and competitive wages seems to me a regressive function demanding, in the long run, fewer specialized ("high") skills of most participants --since producers so seldom voluntarily distribute to employees "productivity" gains.

This development need not be onerous, if money market inflation remains sequestered and Westworld legislatures can be persuaded to take up social insurance projects such as medical service and education.
 

Diversity is the key to economic and political evolution.