not sure if I can answer all your questions since it's been a long time since I used it.
yes, you can set the grid size as well as type (hex horizontal, hex vertical, square) at any size you so wish.
Not quite sure what you mean by "can u stamp the hexs with an object"
BTW, they have a free trial on the NBOS site with everything enabled except save. Why not download the trial and play with it all day today and buy if you like it?