recompile the source.

Ouch - coming from the highest authority that probably means that there isn't such an option yet huh. Thanks 😀

yeah, if somebody wants to. They could take the offer and see if they can make a patch that can turn on/off the mouse. Since it's not a major thing on the list.

I need that feature too. Some DOS applications automatically check mouse and set it as input device. Unfortunately, when they set mouse it doesn't support keyboard input. Not a clever applications...

I'd appreciate if it's possible. 😁

As stated above, grab the sources, modify them accordingly
and recompile them.

Use my build or another one which includes "More parameters support in internal commands". Hit "mouse /u" on command prompt (dosbox).

Or you can recompile dosbox with a patch below

1--- ./src/ints/mouse.cpp	Tue Apr 11 01:57:02 2006
2+++ ./src/ints/mouse.cpp	Tue Apr 11 01:55:38 2006
3@@ -619,10 +620,13 @@
4 	case 0x00:	/* Reset Driver and Read Status */
5 		mouse_reset_hardware(); /* fallthrough */
6 	case 0x21:	/* Software Reset */
7+// Disables mouse
8+/*
9 		reg_ax=0xffff;
10 		reg_bx=MOUSE_BUTTONS;
11 		mouse_reset();
12 		Mouse_AutoLock(true);
13+*/
14 		break;
15 	case 0x01:	/* Show Mouse */
16 		mouse.shown++;

That surely creates interesting problems as the mouse is still
revectored on the video mode changes.