Hi,
What version of Tresos Studio and RTD are you using?
As for the 41, could be a typo, I have reproduced the example and it return an automatic 41. As for the SRE, I did have that option for the UART1_RX pin mentioned. Did you modified the Mscr field as specified?
SRE should not have an impact in an input pin, given it is more related to the output current and the higher the frequency, higher the current (we can say 50 MHz will have a faster rise/fall time than the 10 MHz option). Still, the option should be there.
FIRC_CLK is related to the internal clock source that S32G has available [Page 778, Chapter 23.2.4, S32G2 Reference Manual, Rev. 6, 11/2022]. FTM (FlexTimer) is a timer module [Page 1943, Chapter 43, S32G2 Reference Manual, Rev. 6, 11/2022]. FTM_x_REF_CLK is the source clock for the related FTM module.
Please, let us know.