POLYRATE questions

 Dear netters:
 	I am beginning to use POLYRATE in intramolecular proton
 transfer in symmetric wells,i.e.,malonaldehide and similar systems.
 I have decided to use a numerical surface with the POTENTIAL=unit30
 option,and I have got some doubts:
 -How could I extrapole the MEP after reactants or products?
 -How many points are necessary to obtain right results?
 -The effect of tunneling in the malonaldehyde is very important,
 Do I need to use large curvature tunneling to obtain the rate constant
 and evaluate the kinetic isotope effect in these molecules to obtain
 good results?
 -Do I need to know how large the reaction coordinate is to make these
 Thanks and best regards.
 Antonio F. Ramos