4) Full Custom party start for solo play
Still nothing on this. There are a few workarounds. The one I used is for my buddies to join my new game, make the exact character I ask for and then I am set. I just did this using my Wife's account to make a companion for my Paladin.
5) Increase party size to 5 or 6 (Solo and coop)
There is a mod for this but be careful using this. The increase party size can really break the game balance.https://www.nexusmods.com/baldursgate3/mods/327
I use this mod rather than Increase Party Size.
Recruit any NPC - Transform NPC Into Playable Character - Make Full Custom Character Party - No party limit - Resurrect Deadhttps://www.nexusmods.com/baldursgate3/mods/1646
I am running a party of six currently. My two extras are Bryanna (the sister of the True Soul killed by the owlbear) and Cyrel (the merchant dodgy paladin in the Tollhouse). Made Bryanna a ranger and Cyrel a wizard. We are currently in Act 2 (the Last Light).
Can't swear on it but I think this mod may make a full custom party doable.
I don't feel there is a noticeable game balance problem as I use several mods which make things 5e/RAW (playing on normal).
This is a nice little mod:
Cleric Subclasses - Releasehttps://www.nexusmods.com/baldursgate3/mods/432
I respecced Shadowheart to Twilight Domain mostly for RPing reasons - Twilight seemed a better fit for Shar than Trickery.
I also use the more backgrounds mod.
I use 20-24 mods and it's nice to see them all working well and they are getting updated on a regular basis. Touch wood, I've not had any problems with hotfixes and patches so far. I did break my first game with a mod but that was entirely my fault.