modify rtl-sdr.h to lower the sample rate at 125000

Hello dear RTL-SDR community, I just whant to ask if it's possible to modify rtl-sdr.h to lower the admissible sample rate. I am currently using 8 dongle successfully but would like to use 12 dongle simultaneously with software (rtlsdr-wsprd) to decode wspr signals. This one uses the library rtl-sdr. I would therefore like to be able to use sampling frequencies lower than 250000. Thanks in advance!