I know mate I have too and the amount of my spare time over the years trying to fix things in the editor is soul destroying, as its something all the time.Taken a few days this year fixing things
NB new platform for 24/25 that should be fun,they have had over a decade with this system and there are still many bugs, so a new oneπ
I am over it totally.I want them to stop releasing the editor that way I wont be tempted, and there wont be any Mods to create.
The options are as you say manually but its the transfer budgets only the actual balance/sponsorship etc gets updated
as regards a transfer window thats a good call however some leagues /nations have a window opening in june [English leagues] so the custom start date would have to be May
also all nations would need to be done manually as you cant set a universal 'mini' window for all nations.