Feature requests:

1)
how about a feature regarding margin trading:
It would be nice to close a long position by buying the bitcoins / close a short position by selling the bitcoins.
Following example:
I have 1000€ at my account. Now the price is dropping hard and I want to buy as much bitcoins as possible. But 1000€ is not enough and the deposit time takes too long.
Now it would be nice if I could buy up to 5000€ bitcoins with margin trading.
And as soon as my deposit of new Euros arrive, I want to be able to close this margin position by paying the rest amount of euro and get all the bitcoins I bought, without the need to close the margin position by selling the bitcoins again.

Is that possible?

2)
Some exchanges already implementet BitGo as a partner.  Bitcoin transfers from and to a BitGo bitcoin address is instant (with a slightly higher fee). Maybe you can also add this?