Absolutely! If you don't exceed the electrical limits (there are limits for groups of pins too) you can have them all on at once.
Two pins driving LEDs should be fine (with, say, a 270 ohm resistor each).
Absolutely! If you don't exceed the electrical limits (there are limits for groups of pins too) you can have them all on at once.
Two pins driving LEDs should be fine (with, say, a 270 ohm resistor each).