Hi Ben,
no, currently you can’t constrain the MaxDD in QuantTrader. But in the advanced parameters you can put a limit on volatility, so that QT limits the allocation to the strategy and puts the rest in “cash”.
Also please note that the MaxDD refers to a single event in the past, it is not really a metric of the “riskiness” of a strategy. Volatility is a much better metric for the overall variability, and therefore the probability of a mayor drawdown.