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im pretty sure you can, dunno if rom toolbox can, but if you crack open the right framework file its in there somewhere
combining the wifi and signal bars would be a change of behavior though so it would require reprogramming. you will probably even have to reprogram the behavior of the bars to get them to act right unless oyu just wanna make both 4 and 5 bars full bars
Xposed with tweakbox module has the option to change the number of bars to 5 or 6 not sure if that's what your looking for says Samsung only I haven't tried it yet. Also tweak box is included in superrom.