Nope, and you can assure yourself in this by entering their website and navigating to the appropriate section.
As far as I know the broker isn't interested in burdening traders who like to trade positionally with excessive swaps. Otherwise it would only scare them off.
Metals, for instance, can be even traded with positive swaps, meaning that you'll get money for leaving open positions overnight =))

Not much.
I had a situation when I needed to leave eur/aud positions overnight as the forecasted breakout didn't occur that day, so I was sure that it would happen the next day, I didn't notice that charged swaps somehow made my deposit draw down. I shorted that position and in points swaps were around -1.8-2.2 approximately.
It seems to me optimal, idk...
You can always check the swaps on the website, they are given for all instruments, and then you can make simple calculations to adjust the position size.