I want to request a scripting command to draw list of triangles instead of going one by one with current drawTriangle.

I suggest making it have two syntaxes:

CONTROL drawTriangles [[ARRAY1, COLOR1, FILL1], ..., [ARRAYN, COLORN, FILLN]]
and
CONTROL drawTriangles [[ARRAY1, ..., ARRAYN], COLOR, FILL]
Can be quickly checked which syntax to use by checking length and seeing if 3rd element is a string (FILL) or not.