Not that I have encountered Glen no. Just brokerage.
It is worth considering though to leave a bit of “padding” in the account so that you don’t encounter margin calls.
As an example, if you have 100,000 in your account and you are running an MOC that uses 40 signals at 10% I would use say 95,000 as my account size in the system so that there is always an extra bit of cash in the account should all signals get executed on the same day.