That is kinda odd to have side quests that aren't entirely optional in this case. Also, Frederick was good because he was a strong promoted unit. After a few chapters (especially in the second arc of the game) he starts to be less useful due to enemies simply getting better and him not being able to keep up, all the while I rarely fought mages from that point in the Awakening campaign.
I will just have to take a look at the Steam version to see if things change. I will take all of what you said in consideration and will have a final critique of your game from there. Plus, I am interested in how your game ends...
Edit: Welp... I see that the game is $9.99 to play. As much as I do want to see how it concludes from the IGMC version, I am not willing to spend money on it. It's a shame, but I will respect it. In short, I can only wish you the best of luck in finalizing Falnarion Tactics.
You have something that can be really great, no doubt.