Leverage 
is NOTHING more than the amount of deposit required to control a position. It does not change anything other than the capital used to hold a position. It does NOT change your risk or your position size.
Your position size is controled by the number of contracts you take. Your risk is controled by your stops. Together they form your
money management 
. Your level of
leverage 
should have no involvement in your
money management 
. You should take the same number of contracts and place the same stops, regardless of the
leverage 
.
Leverage 
will simply allow you to play with less cash on the table. If you look on the deposit as the position you will disillusion yourself, it is only the controling deposit.
Unlike the stock market, we do not own anything. We are only playing the differences between two entities, one against the other. The only reality is the risk.
......
100:1 is standard Forex
leverage 
, up to $100,000. After that many brokerages have further limitations. At greater than 100:1
leverage 
some brokers will deny leveraged interest, but you will still have to pay it. I havent found this in any of the MT4 brokers I have studied, FXDD and FxPro both
offer 
full interest on all
leverage 
levels, but it does exist. Especialy when you have more than 100K in an account. Thats when all the limitations seem to come out.
......
Leverage 
is very, very powerful when your playing the
carry trade 
and scaling into a long term interest paying position. Imagine, you take an initial position, collecting interest daily, at your prescribed risk level. The position moves in your direction and you move your stop, eliminating risk from the initial position. As you eliminate the risk you are able to take an aditional position with the same risk allowance, collecting full interest on both.
As time goes on and the position grows over weeks and months, constantly raising the stop to lock out risk and lock in profit, the only limitation you face is the size of the deposit required to hold the position. At 100:1 every lot you hold requires a $1000 deposit, at 500:1 it requires $200, at 25:1 it requires $4000. You can see the difference when you are holding many positions long term. High
leverage 
can allow you to build huge positions and collect huge interest on their dime.
.......
High
leverage 
has much less use when
short 
term and day trading. It simply allows you to overleverage your account easier. It should not change your
margin 
requirements drasticaly, other than to compensate for the lack of deposit. It does not change your risk which is dictated by your stop and position size.
If your stop is 500 pips, that is your risk, not the 100 pips you put up as deposit on a 100:1 account. If your risk is only 50 pips, then you are paying twice your risk for a deposit. No problem if your day trading, but a big problem if your trying to emulate Soros and accumulate the biggest position your
margin 
will allow against some imperiled imperial
currency 
.