If you want to max out your paragon and renegade in ME 1 then it is easy with Lorik Qui'in. Just get him in a conversation loop regarding the evidence and you can get as much charm and intimidate as you want.
Personally I just use the console commands now but the Qui'in glitch is handy if you want to do the same on the consoles.
The wiki indicates you need to have 5 charm/intimidate points to be able to charm/intimidate him. So you still either need to invest some points in these skills, or do like I do and go with a new game plus.
The Pyjak glitch on Eletania is easier to use and doesn't require any points in charm. It only works for gaining paragon points, however.
Using the Lorik Qui'in glitch only helps to maximize the Paragon/Renegade bar(s). Using it will not maximize the points invested in the Charm or Intimidate talent trees.
To clarify:
- You gain 1 point in Charm and 1 point in Intimidate when you become a Spectre.
- You gain 1 point in Charm/Intimidate when you fill 10% of your Paragon/Renegade bar.
- You gain 1 point in Charm/Intimidate when you fill 25% of your Paragon/Renegade bar.
- You gain 1 point in Charm/Intimidate when you fill 75% of your Paragon/Renegade bar.
You can gain a maximum of 4 points in Charm or Intimidate for free per playthrough with a character. So to max out your Charm and/or Intimidate bars, you need to play multiple playthroughs with the same character, or spend points into Charm or Intimidate.
Persuasion (Charm/Intimidate) options in ME1 are based on the points invested in Charm/Intimidate, not on the Paragon/Renegade bar.