ToME: the Tales of Maj'Eyal

Since most characters (as has been discussed) need at least one and possibly both of the extra slots for infusions/runes, and the game was balanced for access to 3 extra trees, I would suggest changing the category point gains to be at levels 7, 14, 21, 28 and 35. This keeps the balance from before when (effectively) unlimited potions/scrolls were available in my opinion.

There's a way to get a fourth category point in game already. So for non-Cornac that's 4 talent slots (2 for runes and 2 more for talent categories).

Personally I think that's enough for most characters. If it's not you can always play a Cornac and get a fifth slot.

That said I do support Sirraco's idea in the other thread about extra category points giving .2 mastery and being capped at one category point per talent tree to keep the mastery boost competitive with extra rune/infusion slots. This keeps spending category points on runes/infusions an option rather then the preferred choice, something I don't think raising the number of category points helps with.