Ответ
Vector 3 will have a color picker later, but it will not be "replaced" by a picker. Technically, a color is limited in the 0-1 range, whereas Vector 3 can have negative values and values beyond 1 :)
Obviously this raises the requirement for a 'colour' parameter we can expose to the material too. 3 x Sliders is a little painful :D
Which is another request in and of itself :) Feel free to add a post about implementing the Color Parameter
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This is now implemented in alpha 0.06!