Say I am playing a low Charisma character, but I really want the Intimidation perk. I know you can train your SPECIAL up, and about the SPECIAL book, and bobbleheads... But if you get a temporary level 10 Charisma through clothing and chems for example, would you be able to gain access to the full Charisma tree when you level up?
Secondary question.. When you do level up, do you HAVE to allocate a point immediately? Or can you exit out, pop a mentat, then go back in and choose your perk?