you can import the hessian by writing it in nwchem format 
(asci lower triangle I think) ... the easiest way to check 
on the format would be to just run a frequencies calculation 
on a small molecule and look at the file.  it is in atomic units. 

there is no advantage in importing a gradient so the code 
does not do that. 

unless you have a rather odd molecule, or the redundant internal 
coordinates are not working for it, or you are looking for a 
transition state, there is usually little gained from importing 
a hessian, since the initial guess is reasonably good. 

robert