Maximum graduate assistant workload with research + teaching
Currently, graduate students are not allowed to have more than 20 hours/week commitment during the academic year (though domestic students are allowed an extra 5 hours hourly), nominally in order to allow students to focus on their studies. However, this means that fully research-based graduate students (0.5 full-time equivalent RAship during the academic year) are prohibited from getting teaching experience, which is important to be competitive for academic careers. Meanwhile, the "focus on studies" rationale doesn't make sense since, for a PhD student done with their classes, their research assistantship effectively is their studies.
I can understand having some limit, but it should be raised to a minimum of 30 hours/0.75 FTE, which would allow a full RA workload plus a 10-hour hourly TA position. This would allow PhD students to gain important teaching experience while focused on research. The higher limit could be only for PhD candidates, if that would be necessary.