It sounds like you already know what you are looking for, but you just don't know it yet. Try the Socratic method.
However, if you use the method you described above...
...you are essentially substituting a Spot check for a Search check. If anyone can see an irregularity (and who can't?), you've basically clued anyone that can make the Spot check into the presence of the trap. Maybe a rogue has to make another Search check to learn how it works (which would really make it a Find Traps check, wouldn't it?) and then a Disable Device check to disable it, but anybody could be become alerted to it with a sufficiently high Spot check.
However, if you use the method you described above...
I follow the logic a few posters have claimed... searching every 5' square is insane! So I figure Spot will allow said Rogue to notice anything fishy (like the singed marks above). At which point he can move to that area (5' square) and actively Search for the trap
...you are essentially substituting a Spot check for a Search check. If anyone can see an irregularity (and who can't?), you've basically clued anyone that can make the Spot check into the presence of the trap. Maybe a rogue has to make another Search check to learn how it works (which would really make it a Find Traps check, wouldn't it?) and then a Disable Device check to disable it, but anybody could be become alerted to it with a sufficiently high Spot check.
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