Yes it is possible...I'd recommend checking what the value in $modespl is since that will determine the maximum number of modes that can be changed at one time.
For example if $modespl was 12 then you could do
/mode -oooooo +vvvvvv <nick1> <nick2> <nick3 <nick4> <nick5> <nick6>
To determine what the value in $modespl is I recommend using //echo -a $modespl
