There’s no helping with your first complaint (UI philosophy difference), but fwiw you can both have focus-follows-mouse (for either the whole OS or just Termina

There’s no helping with your first complaint (UI philosophy difference), but fwiw you can both have focus-follows-mouse (for either the whole OS or just Terminal, both work great) and multiple button support (I use a 4-button trackball with other fancy bits). That said, despite being able to hack lots about the system, it would definitely be nice to have deeper modifications allowed. Alternate kinds of menus, pointers and windows would be nice, where users could experiment with new UI concepts, etc. I personally really miss NeXTSTEP’s tear off menus, which were in early OS X builds until Aqua got rid of them.