While I agree that more options like that would indeed be nice, I do feel that the underlying causes that can be easily fixed should be the top priority. Using assets and tech that already exists within the game, it would be a pretty simple matter to, for instance, add an option to make a Fellow behave like [insert any Trust here].

Though this alone would be nice, it still doesn't solve the other issue: Fellows aren't considered part of the party, and thus, are isolated from Trust buffs, healing, etc. This is why I think Fellows should have higher base stats than typical Trusts. Allow them to DD and hit things a typical DD Trust wouldn't be able to. Make them be able to heal better than a standard WHM Trust. Let them be able to tank more effectively by taking less damage than a Trust, etc. Then you can make a party with your Fellow in a key position, and build your party around it. Fellows are special, and should stand out from Trusts. It isn't like you can build a full party of Fellows, the most you can have is three, from three separate players (which I'd love to see!).

Once they become viable for solo or low-man play, I'd love to see more options get added, like the ones you described. It would further improve the system, and give us a reason to level Fellows. Make them useful enough, and people will have a reason to go through the steps necessary to build a good Fellow.