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It's best to turn off mic bias if you can. But it won't actually matter to
the Softrock because it has blocking capacitors on its I/Q outputs, so that
bias won't reach the rest of the circuit. If you use a fancy interface with
phantom voltage support, turn that off; it's a much higher voltage,
nominally 48V, that could cause issues. If you have an interface with combo
XLR/TS input jacks use TS connections for line input (those bypass the mic
preamps), not XLR.

The I/Q inputs for transmitting also have blocking capacitors, so again DC
bias shouldn't matter. Those blocking capacitors are only rated for 16V so
a large DC bias could be an issue, but you're unlikely to encounter that
problem.

I haven't seen a recent laptop with a stereo audio input. Most of them have
given up the separate input and output jacks, and instead use a combined
headphone/microphone jack like the ones used on cell phones for using wired
earbuds. That connector only supports a mono microphone input.

High end audio interfaces with 24 bit support and low noise inputs will
give you slightly more receiver dynamic range when used with a SoftRock,
especially if you modify your SoftRock to fully exploit its capability.
(Past posts in the group have addressed that.) Support for higher
sample rates like 96 or 192 kHz is nice because it lets you see more of the
band, but again you might not want to spend a lot to get that. It's hard to
justify the purchase of a high end interface just for use with the
SoftRock, as they can cost considerably more than the rig does, but if you
already have one for other purposes like audio work you can go ahead and
use it.