Is it possible to use makecert in order to generate ECRSA, Diffie-Hellman, EC Diffie-Hellman asymmetric public keys and DSA, ECDSA for the private keys.
You can't use makecert for things other than RSA and DSA. If you need elliptic curve keys and certificate, you have to use other tools like the OpenSSL command line which has a more comprehensive support.