Backspace key settings

Hello!

I've always used the Samsung keyboard before, but it lagged a lot on my new phone, so I was told to try another keyboard. Swiftkey has solved my lagging problem, or at least I don't notice it as much, but instead I find that I'd like to customize my backspace button. When I hold down the key, it deletes entire words instead of just letters, which really gets on my nerves when I make a typo in longer words (I type in Finnish too). Additionally, I'd really like to rearrange the "symbols" page (the one that pops up when you press the 123 button), though I suppose I'll grow used to the new order of keys in time if rearranging them isn't possible. But is there a way to change settings for the backspace key?

Thank you!