There's some code supporting multiclassing.
Theres work to do about setting spellcasting modifier with multiclassing. Some abilities just uses casting spell modifier..when you multiclass you will have two. Maybe they'll set these as the higher stats.
Other spells are unlocked to use a certain stat so that's fine.
Some players say multiclassing is too powerful and should be banned. Other players say multiclassing is too weak and should never be used. Lol