Hi,
I think it would be very nice if the CSR registers time (3073) and timeh (3201) could be implemented, as simple as
long csr_time = System.currentTimeMillis();

Suggestion:
Maybe, to reduce the computational complexity, instead of continuously showing their values in the register bank panel, these values can be updated only when these registers are read by csrr t0, 3073 or csrr t0, 3201 instructions.

We are implementing these registers on RISC-V hardware (FPGA), and this improvement in Rars would be nice to maintain the "compatibility".
Of course, there are many other issues involved, such as step-by-step execution and back step tracking, as you said before, but we can deal with this in sequence. :)