Did you update the graphics card? Possibly roll back a version if so. Here is a repair link. A reset is a reinstall, don't do that. https://flightsimulator.zendesk.com/hc/en-us/articles/360016107019-Microsoft-Store-version-How-to-repair-or-remove-and-do-a-clean-install-of-Microsoft-Flight-Simulator
I don't see why not. 2 different programs, 2 different setups. But if you are asking that the way you set it up in DCS, then would that transfer and save in MSFS, then no. You would need to create your assignment in either program.
I have that from time to time with a 60+ crosswind. Not veering off, just not right on the MFD path. You also might gage by looking at a moving map in conjunction with the veer. Your controls are calibrated and do not have a yaw or roll induced. No other keyboard press's interfering? One last thing. Is this in the default Asobo? Best of luck to you then. The FBW mod, Dev version is completely decoupled with the Asobo version.
I have found that when in this state, there are many switch's that are not really in the On & running state. In your original case, just spooling and no start you might confirm APU bleed air & start switch in start, not normal.
I'm guessing that if you loaded the aircraft into the sim and had switches already on, you were not in the FBW, but the default A320. Please confirm that. When I load the FBW, everything is off, Cold & Dark.
It does have a camera setup section. You do get an overview of it. What I found was to use Youtube and search for MSFS Camera Tutorial. Hope that helps some. BTW, This manual from SoFly did help me better understand graphics settings.