Signal power is good idea, but wouldn't the signal quality (!= power) be more useful? You can easily collect IVs from low-power, high-quality AP, or You can got problems with -50 dB AP; if, by some reasons, it's signal is of constantly bad quality.

Of course, no reason to not include both - there are plenty of space in detected APs list

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Saturn, can I grill You again for not including broadcast deauthentication in WEP mode? Man, in new layout, there is plenty of space available for 4th button

/Estel