Ok, so I was reading my psychology textbook, and of course I just happened to come across Conditioned responses right after thinking about Reality Checking. Its pretty simple, you tie a external stimulus to an internal effect-soooooo, why don't we tie the external stimulus of a dream sign, to an internal affect of increased lucidity. First, you find out common dream signs, maybe its your sister, maybe its sex . Then, you condition it. Now, according to my psyche book, it takes 7 times to fully condition a response to make it automatic and unconscious. Then it lasts for 12 times with full intensity at that conditioning level until it begins to drop. SO, heres the "technique".

Find out dream symbol.
Draw it, or get a picture.
Put picture face down in your lap.
Clear your mind.
Raise picture so that you can see it easily whilst looking away, then flick your eyes toward it.
Once your eyes hit, State aloud, "This is a dream" and mimick internally the feeling of knowing its a dream.
Repeat 7 times, and make sure you get the full feeling before you put the picture down.

This also has to do with thresholds of awareness, and how you are kickstarting your threshold. You can also condition a Reality Check, but be warned, this will be a conditioned response, meaning that you will do it automatically- so say you are in front of a cute girl, and she is wearing blue earrings, and this is a dream sign, you will immediately pinch your nose and try and breathe through it...so just be careful lol. Thats why I am doing the "This is a dream" knowing/feeling conditioned response to all stimuli, and to just have it constant.

Anyways, let me know how it works.