smart manwell i'm doing just fine with the separations i did myself (not every slot has a save) and the screenshot icons. i know what part i played and saved in each single tab. as far as i'm concerned, Ren'Py can easily handle up to 256 tabs, so i can create new tabs with again 8 slots on every game branch i consider Major. works on this game, works on other games. for me, anyway.
*edit* example: tabs 1+2 are bk1-S tabs 3+4 are bk1-L
and so on.