Although the iD editor you're using provides drop down boxes suggesting that all the access values should be filled in, that really isn't necessary here. That's not your fault, it's poor design.

If you have a highway=footway, that implies access of foot=yes + (everything else)=no

Adding access=yes to highways is usually wrong, as it means that all modes of transport have a legal right to use that highway. More specific access tags override that, so the (otherwise unnecessary) motor_vehicle=no takes precedence.  The horse="not specified" and bicycle="not specified" tags will likely be ignored by routing software, as "not specified" won't be understood by routing software and access=yes might take precedence.

https://wiki.openstreetmap.org/wiki/Key:access