Allow custom setting of maximum and minimum values on the signal strength scale:
The signals that I observe tend to be weaker than -55 dbm, so I would like to set the maximum signal level to -50 dbm. I assume that the pre-set maximum value (-15 dbm) is driven by some sort of constant, so it should not be a large effort to add a user interface (under "View", for example) to allow this value to be altered. Similarly, the minimum signal level is currently pre-set at -100 dbm. Allow the minimum signal-level value to also be set by the user. Then spread the viewing pane out to accomodate the difference between the specified maximum and minimum signal-value levels.