537.745.  Construction of provisions. — 1.  Nothing in sections 537.700 to 537.755, shall be construed to broaden or restrict the liability of the public entities participating in the fund beyond the provisions of sections 537.600 to 537.610, nor to abolish or waive any defense at law which might otherwise be available to any public entity or its officers and employees.

  2.  All persons and entities protected by the fund shall cooperate with those persons responsible for conducting any investigation and preparing any defense under the provisions of sections 537.700 to 537.755, by assisting such persons in all respects, including the making of settlements, the securing and giving of evidence, and the attending and obtaining witnesses to attend hearings and trials.