Macos – have a bunch of tabs set up when I launch Terminal

First, you can set up multiple terminal windows, each of which can start up with a command. Just go to Terminal --> Preferences --> Settings, and create a window for each of the commands you want to kick off. Next, Terminal has the concept of "Window Groups". Open those terminal windows you want to kick off, and then save them as a window group using Window --> Save Windows as Group. Finally, you can start up Terminal using a window group. Go back to Terminal --> Preferences, and go to Start this time. Under "On open, start", select "Window Group" and then the window group you created. This will make it so on start up, terminal will kick off that group. If you just want to be able to kick off the group, but not do it on start up, just skip the last part, naturally.

To send codes to the terminal from bash you can use the printf command. (You can also use echo, of course, but printf is generally better suited to sending terminal commands, since it has explicit support for sending ESC and makes it easier to separate the command characters from parameters, etc.)

Tmux, as well as most popular programs that support terminal mouse tracking, use XTerm Mouse Reporting (aka “X11 Mouse Reporting”).

To disable Mouse Reporting from bash, use this code:

printf '\e[?1000l'

ESC [ ? … l means “DEC Private Mode Reset (DECRST)” (the same code ending with an h instead of an l enables the feature).

There is also an older “X10 Mouse Reporting” protocol, which uses 9 instead of 1000, that can be disabled with ESC [ ? 9 l, but as far as I am aware you’re not likely to see this feature used for mouse tracking.

I normally use the Xterm Control Sequences documentation as my canonical reference for terminal codes and I recommend it, since it is both a practical guide to what XTerm supports and it is also the most comprehensive documentation of commonly supported codes that I've found.