Yes it is possible. You can just use it in a session as part of a trade plan. You need to find out if the System calls the SetTradeRisk function. If yes then you can run a percent risk plan. If not you need to call the System from a rapper which sets the SetTradeRisk Function

 Sub BlackBoxCall(SLen,LLen,DollarStop)

  BlackBoxSystem(SLen,LLen)

  SetTradeRisk(DollarStop/BigPointValue)

End Function