How to get unlimited feats and stats points
By "unlimited feats" do you mean "exactly as many feats as a level-capped character would normally get"?
That sounds like ISPs who grant "unlimited downloads*"
(* subject to a Fair Use Policy that throttles transfer rate after a certain point
* also subject to the limits of the data links they manage)
If so, then by that word usage, you will live for an unlimited* number of years
(* where "unlimited" means "an average human lifespan, give or take, subject to status, written details on request, your mileage may vary, not to be taken while pregnant, always read the label, not to be used while driving or operating machinery, by reading this sentence you have authorised the use of cookies to raid your fridge, terms and conditions can vary at any time without prior notice, click somewhere else to unsubscribe").
Many games can be manipulated like this. I would rather the game have a simple memory map while the programmers focus on a great game than that they obfuscate all variables (eg storing every number as *10+75 and retrieving every object property through a getter that does (-75)/10) and charge a higher entry fee to cover their costs.
I use Cheat Engine, but I use it for a different purpose. If I close a browser window or a word-processing document with unsaved changes, I use Cheat Engine to access the raw text that's still in memory before it gets reclaimed. Peek/poke is a useful strategy for all sorts of purposes - I've been using it since at least 96 and I am sure it predates that by a long shot.