Description about MoveIt's OMPL Python Interface

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I am using ROS Noetic to control a UR10e via MoveIt. I've set up Gazebo and can move the robot in there using the MoveGroup Python interface (following this tutorial). I am now trying to understand and benchmark the different motion planners that are available in OMPL.

My overall question is: where can I find more information about MoveIt OMPL planners and its Python Interface. More specifically:

(1) Where can I find (more) information about which parameter is available for which planner? I was hoping to find a succinct description. It is said here that "settings can typically be found in the ompl_planning.yaml", which is true (to some extent), although I couldn't find longest_valid_segment_fraction there by default. That makes me wonder if there are other options that are not listed. There is no description of the parameters in there either.

(2) How can I change/adapt the parameters via the Python Interface? For example, I found set_num_planning_attemps(). I also found somebody referencing set_planner_params() here, although I can't find any trace of such a method in the Python Interface (is that only available in C++?).

(3) Using the AnytimePathShortening planner (which I selected via set_planner_id() I do get much better results compared to simply using RRTConnect for example. How can I figure out which motion planners are used by the AnytimePathShortening meta-planner and how can I modify them?

Many thanks!