Question 1:
Not included in nvMiner.
nvMiner for now only includes all known ccminer algos that all of the different devs have released.
But it doesn't include the algos in CudaMiner with the exception of keccak

Question 2:
The number is the "average" hash rate submitted.  It is more useful on some algos as the hash rate fluctuates a lot.
Inside the parens is a number dash number or just a number.
When there is a dash you will see the number to the right decrease for each submitted share.
Typically you won't see the "average" hash rate stabilize until this number gets close to zero. But it depends on the algo you are running.

Hope that helps,
Carlo

EDIT: DougB62 responded before me and I think his explanation is better.