Thumbs up for the previous posters. On a decent charger 1 amp is fine, though 0.5 is good too if you want to be extra cautious. It's at 1.5 - 2 A that batteries can start overheating, although it depends on the charger and on the batteries themselves. You can tell whether you're charging them at a healthy rate by how much they heat up. Warming up a bit is fine, getting hot is not.
ETA: I missed your other question. I'm not familiar with that charger, but the FastTech picture shows it charging with red LEDs above the batteries. I'd assume the LEDs would turn green when it's done as that's pretty much the standard.