Possibility to add any configuration option into profiles, I would not use some of them personally. The earlier this gets implemented, the less work it would be later.

Config Options - personally used:
- Split Tunnelling (individualisation for each profile, low prio)
- Moderate NAT

Config Options - not personally used:
- Port Forwarding
- Allow Alternative Routing
- VPN Accelerator
- Auto Reconnect
- Custom DNS (individualisation for each profile, low prio)

In short, basically any config option being available to save into a profile as well.

Have a great day, Proton team!