I prefer the engineering solution that improves the smell in restrooms.

A laminar (sp) flow "air-curtain" from fresh air directed down at the doorway to isolate the restroom. Combined with an overall positive (to local environment) pressure airflow design such that the restroom is one of the lowest-draw places in the building and has a direct egress for ejecting air.

The toilet could probably be improved by use of a UV clear lid shaped to let any backspray drip back inside of the toilet, a UV sanitation lamp (on either low voltage AC or DC with ground-fault protection systems), and maybe some minor automation to lift the lid and/or seat again depending on settings.

Upgrade to modern bidet (asian/Japanese style) toilet optional.