I appreciate that themes change, but I feel there must be some means of differentiating between alias and non alias fields. Maybe a thin red border around the field would be nice?
This! :) I very much growed accustomed to the form field indicating the use of aliases in the right places. I also cheered at the new UI and things like those comment lines in rules - really great! - but I miss the fields indicating the use of aliases, too. Now it simply isn't clear where you can or can't use aliases. Also, I didn't understand, why you can use aliases in Port Forwards or even Outgoing NAT rules, but not in 1:1 BiNat mappings. Doesn't make sense, as PF uses very similar rules to create those mappings where you can indeed use aliases. As for DHCPD, OVPN et al, that sure would require a little bit more programming though, but inside the same "application" (like PF) it shouldn't be a great deal to consistently use them.
Greets and thanks to the devs!
Jens