Congrats to her on the 99 EX. I too have one.

#1 My gas gauge does the same thing - 250 out of the top half, 100 from the bottom half. And I can drive on E for what seems like forever.

#2 It's supposed to lock - check the override keyhole, it might be jammed open.

#3 You may need to adjust the headlights - they might just be misaligned.

I think my Civic headlights are pretty bad. My high beams are good but the low beams don't do that much IMO. I have OEM fogs which help a lot.