For the TI-99/4A I use the Default Command-Line Parameters
ti99_4a -ioport peb -ioport:peb:slot2 32kmem -ioport:peb:slot3 speechadapter -cart
With proper softlist emulation (Remove file extension and folder path box enabled), the cart parameter can be dropped.
To skip the intro screen and also auto-select the game option at the TI BASIC or game options screen you can use the expanded parameters
ti99_4a -autoboot_delay 1 -ab \n\n\x32\n -ioport peb -ioport:peb:slot2 32kmem -ioport:peb:slot3 speechadapter -cart
Increase the -autoboot_delay value if you prefer a longer look at the intro screen.
To get a longer look at the choose TI BASIC or game screen add more \n entries.