Custom Blocks?

Hi, is there a way to create custom blocks for the RVR? In particular, I want to set the left and right raw motor values, without having to specify a time. I just want the motors to run at the set values until I program to change values. I want to use the block to get the RVR to follow a line (an edge actually, between a white background a black tape). Simple to do in LEGO Mindstorms.

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