Confirmation delays are out of Bitsler's hands in about 90% of the time. I am not sure how many times i've said before, when player chooses a fee (0.0004, 0.0006), you are actually paying for a (normal, priority) transaction, and not the fee it self. So, if you pay for priority transaction, bitsler will send out your withdrawal using whatever is the highest priority fee, most of the time bitsler pays more that what is deducted from you. And once that obligation is completed, it is now out of bitsler's hands.
Even I, had to wait 20+ hours for my transaction to get confirmed,
https://blockchain.info/tx/1478130aca22a68104bf1f6dbde58f348c362cc06fa3baae61e6e244ff8d7403 . So no one is immune from this wether you are a Bitsler staff, Bitsler developer, Bitsler player etc.. But the important thing here is, Bitsler fullfills its obligation to pay the players.
Sometimes withdrawals can be flagged by the system and get your withdrawal pending for approval. Now this part is Bitsler's, it is to prevent any fraud, illegal faucet farming, multi accounts etc.. Bitsler tries its best to give quality service for its players and at the same time protecting its assets, investors, brand etc from frauds.
I think what is best to do with the withdrawals would be to have the old system combined with a manual fee system, first, a player could manually put what fee he wants(with a minimum of course). And this fee will be deducted from the player, and the withdrawal will also use that exact fee. Or, a player could still choose from the old system, paying 0.0004 for a normal tx, and 0.0006 for a priority transaction. Again you are paying for the term "normal" and "priority" transaction, so in some cases, you will get higher/lower fee than what was deducted from you. This way, we could cater for other players that are willing to pay big fees by manually putting them in, just to get their withdrawals confirmed faster, and at the same time cater other players who just don't care and just wants to get their withdrawal.
Cheers!