There's a donate button in the store now
He want's his scopes a bit faster, so this is the same as setting the ADS and scope conversion to MDV 0% Scale 105% (or close, see next answer)
Absolutely correct on the FOV. For the ADS you set the scale of ADS and scope to 104.485%. Apex has a bug where it rounds the FOV to the nearest whole number before calculating scope sensitivity, so if you want it absolutely perfect you need to manually adjust for this if you want the output to be 1.05. I've done this here:
https://www.mouse-sensitivity.com/?share=a586b27230c492ba347ff4394a8ec1f8
360 distance will only be the same for ADS/scopes with the same FOV. You can never trust the stated power in the name of the scopes, a 6X in Apex is not the same as a 6X in BFV etc. The calculator does all the magic for you here, so you don't have to care about it. The important part is that a scope with a specific FOV in Apex will be the same as a potential scope in BFV with the same FOV.
No, if the calculations for the different ADS sensitivity is not the same you have to choose. Select the one with the weapon/aim/scope you use the most.