It's topic for version 2.x

We added a lot of hooks already, if you need new one - submit ticket to helpdesk.

Most important hooks  are  

1. wdp_save_cart_item_keys  (preserve custom item meta)  and wdp_get_product_price  (allow to modify product price).  Usually, they are used together. 

//   compatibility code for Booking plugin
add_filter( 'wdp_save_cart_item_keys', function ( $keys ) {
  $keys[] = 'booking';
  return $keys;
add_filter( "wdp_get_product_price", function ( $price, $product, $price_mode, $item_meta ) {
  if ( isset( $item_meta['booking']['_cost'] ) ) {
    $price = $item_meta['booking']['_cost'];
  return $price;
}, 10, 4 );

2.  wdp_conditions to code  new condition. read detailed how to 

3.  wdp_before_apply_rule  (allow to adjust rule settings)  and wdp_is_apply_rule  (  you can return false to disable rule)

4. wdp_before_apply_to_wc_cart ( used to remove custom hooks for WC cart) and 

wdp_after_apply_to_wc_cart ( used to re-add custom hooks to WC cart actions)

//Compatibility with  Tickera "Seat Chart" plugin
add_action( 'wdp_before_apply_to_wc_cart', function( $wdp_cart, $wc_cart ){
  global $TC_Seat_Chart;
  remove_action('woocommerce_cart_emptied', array($TC_Seat_Chart, 'delete_cart_seats_persistent'), 10);
add_action( 'wdp_after_apply_to_wc_cart', function( $wdp_cart, $wc_cart ){
  global $TC_Seat_Chart;
  add_action('woocommerce_cart_emptied', array($TC_Seat_Chart, 'delete_cart_seats_persistent'), 10);