The parameters for changing views are "VIEW_LEFT_DIR=XX,YY,ZZ" where XX is "XX" is roll, "YY" is pitch, and "ZZ" is yaw. Yaw is set to 0 for views forward, to 090 for right, and 270 for left as in the compass.
Roll applies to bank, and pitch to up or down on the nose. There is no uniform value of parameters because there are no uniform bitmaps taken from a single viewpoint. The user must trial-and-error these values along with zoom values to get the desired effect. Jim Waters.