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First off Majid, yes it does become more and more complex with more party members. That is for sure the case, but I am sure you can get there with time.
The job system I am using is similar to FF 11 online, except instead of picking the 1 sub job and getting the skills from that job at half ur main job level I want you to mix and pick any skills you want. So a white mage could have a black mage skill, but he could also wear heavy armor if you train in warrior, or have a strong melee side etc.
I plan to make the game for PC at first, but a console edition is not off the table if the PC version goes well. There is currently partial controller support in place in my prototype, but most menus require a mouse click atm. To make menu's usable with controller you need to instead of using buttons use highlights so they can move through menus with the d-pad. It is more work than just using buttons the player can click and why I was skipped at this stage, but I 100% plan to make the game controller friendly as I personally enjoy playing JRPG's with my controller or a combination of the two.
As for your own game, I think both turn based and action are solid options. I played the new ff retrograde on PC and I really enjoyed it, however I personally prefer the older ff7 turn based style. The remake instead of gradually building ATB and then using skills / spells / attacks on your turn, you are spamming basic attacks to build the ATB gauge and then using skills / spells when you fill the bar up, while also dodge rolling around like a maniac :) It is fun and honestly I think both styles are super valid ways to play through an RPG, but for me personally I love turn based.