back in the day, acron panels av-6000, av-8000 with the series 3 or 4 keypad, had the led's stay on when armed.. (could be programed off after 10-15 seconds.)
also we have seen at least one system with a radio chip reader at the front door that would bypass the door when the chip holder passed through. would rearm after they got out of range (usually 2-3 feet)
best one I ever saw was with clint eastwood as the thief in "Executive Power" the house he burgled has a firelite fire alarm they were using as a burglar alarm with a flashing red light on a pir as the warning indicator.. it looked like he attached his code reader to the telephone transformer.. I guess he was doing a remote disarm.. LOL
RTS