If you want to scalp using a MT platform you should try:
www.coesfx.com
www.velocity4x.com
www.fastbrokers.com
with no ECN feed you should try
www.fxdd.com
www.alforex.com
Also you really could try Currenex using a FIX engine to send signals from MT4 to currenex or code it into C++. PM or E-Mail me and I can help you...