SwaN-MR is released without testing. No version was never submitted to an alpha-level test. Every user needs to test the program after downloading. Compatibility with older versions is warranted. In any case, when you store your spectrum for posterity, be sure to put a copy of SwaN-MR with it.
Simplicity means a minimum number of menus and commands.
Obstacles SwaN-MR pays for my intrinsic and extrinsic limitations. I am not a programmer. When I began the enterprise I just knew some concepts of Pascal programming. I started without an updated documentation of the operative system. The rate at which Apple changes the OS is faster than my learning rate.