I'd recommend keeping processed hands as they are an extra insurance should you have an issue with a backup file but if you have enabled the 'Processed Hands' option in your backup process they can be manually extracted from the backup file if they are needed again.

I know this post is like 10 years old, but is this still accurate? Yes. Does this mean the player does not have to be the first to raise for the PFR to be affected? Yes. Does this mean the player does not have to be the first to raise for the PFR to be affected? Then what would be the best statisti...

You cannot change the player names in PokerTracker 4. You could edit the name in the hand histories before importing them or if you are familiar with PGAdmin you may be able to modify the database outside of PokerTracker 4 however that isn't supported.

Calculating all possible situations for 3 handed play is not going to be straightforward - see this thread.

I created a player column stat val_p_total_3bet sum(if[cash_hand_player_statistics.flg_p_3bet, cash_hand_player_statistics.amt_p_raise_made_2 / cash_limit.amt_bb, 0]) and a custom player stat Avg 3Bet Size if( cnt_p_3bet > 0, (val_p_total_3bet / cnt_p_3bet), 0 ) It gives an output but not the one I...

No because 'Fold to PF 3Bet After Raise' also includes 2bets vs limpers and it's not possible to steal when there are limpers.

PokerTracker 4 does not calculate 'EV' - see this guide. There is a built-in statistic called 'All-In Equity Adjusted Amount' which will display the expected amount of chips won for qualifying all-in hands in a hand report.

That looks good.

A 'Raise' is any 2Bet so that will cover open raises & raises vs limper(s) from any position. A 'Steal' is an open raise from the cutoff, button or small blind.

I don't have any timelines for adding any new site support but if you have a sample of hands from these poker sites you can attach them to a Support Ticket here.