You can clarify with a Universal TM, but I'm going to say no, because then it wouldn't be considered really an AP perk anymore. Especially since by the time you go inside your 1-day ticket guest is going to have to chill while the APs can continue to do EE, because that 1-day ticket friend is not getting into EE unless they're staying at on-site hotel.
In terms of bad form. Which I'm assuming means doing something that isn't the best thing to do, but can get away with it and do it anyway? It wouldn't be like running when told to walk, or something like line cutting, where as technically you can get away with depending on who notices, or says something, because park tickets look different than an AP and will need to be scanned by a TM who will notice the difference.