I think having income and expense items that are based on percentages of other income or expenses in a more freeform way would be great. I receive RSUs that are based on a percentage target of my salary, but right now I just estimate them as a flat dollar amount roughly indexed to my salary.

This would be incredibly helpful. For now, I just have to take my (salary * (1+bonus%)) as my income. Having a separate income section for bonus and having it be tied to income would be helpful