During development, i thought i should try clamping texture's values, but upon testing this out, it revealed to be a problem. If values couldn't be "darker" than black (0.0) or "brighter" than white (1.0), there would be minimum and maxium values for a heightmap, which is not ideal.
About the blend modes, i completely forgot to add them in the "Blend" node's description! I will add them in the next update, but for now, they are respectively:
0 - Add
1 - Subtract
2 - Multiply
3 - Divide
4 - Min
5 - Max