Okay some answers
Bounce is built in, 10 different preset settings. There are also presets for different flavors for the flippers, as well as adjust ability so you can have a 50's style flipper or a modern style, as flippers can be quite different from different era's, or even year to year. Even the manufacturers adjusted the flippers specifically by machine as they tried to match the natural shots with lanes shots etc, and it was very important to get the flipper angle and coil strength as perfect as possible for every new table they would produce.
For a example, williams used different strength coils, but also adjusted the angle by machine. If you noticed on SS tables, there's a little hole in the playfield at the flippers, that was so the operator when he replaced the flipper assembly could "line" up properly with the correct angles, and of course the coil and internal workings would be the same as well. This is the reason why I have said there is no one generic code to replace all table flipper code, because even the companies would customize their settings by each table to maximize the play value and keep those quarters being pumped in.
From this version of DF2 I have, it's the same thing. Some shots are a lot harder because instead of say the inner spinner lane, they "tick" the center target, or they hit the little slim target slightly, instead of a smooth shot right up the spinner lane. A natural tip shot I set in shivaFlippers was set up to just hit the bottom J target on the left side, while with DF2, it hits the bumper squarely in the middle below and just bounces right back to the flipper. A base shot instead of hitting the L target in the center will hit the top bumper instead and also bounce straight down. Neither shot is terribly exciting to say the least, but that is the nature of the design of the table. Everything is higher up on the table, like most SS tables, and I compressed the shivaFlipper shots to narrow and compress the range of the shots so even though I still have the same amount of shots as DF2, they are just in a smaller area so the player can hit more scoring opportunities within that radius, and add more excitement to the play. Stock DF2 has a rather wider range, and is set up to have slightly different angles for the ball off the flippers, and there fore the shots become a bit disjointed because it wasn't "finetuned" to my particular table.
On the other hand, if I took the exact same code I have now in JG and put it in a modern style game, then DF2 would work far better, because my flippers in Jungle Girl were tuned for one particular style (1976 to 1985 type Bally Solid State games) while DF2 was made for latter games that needed a wider range and the ability to send balls up ramps. My flippers would need to be retuned for that new style of game, just like DF2, even the newer version, would have to be for JG.