Mouse support

[LunaMoo]

Just to inform - new ppsspp includes mouse control ~ for windows.

Enable it on controls screen, then you get new icon "M" in control mapping screen which allows mapping mouse. It also makes some other changes, like disables double click fullscreen and hides the mouse cursor in-game. Has an option to confine the cursor within display window when the game is running as well as some tweaks.

From my testing, there are 2 primary problems why mouse control feels bad:
1) Lack of proper analog translation, most games, even those that used left thumbstick in analog mode end up treating it like digital input and slap some acceleration on top of it which means the camera speed is not affected by how fast or slow you move the mouse, but by how long you're continuosly moving it if at all as many games just have a constant speed.
2) Even if the game would have analog controls, the problem would still be Small range of speed between minimum and maximum speed as moving analog stick never offers instant-fast changing of directions.

No emulator-side tweak or setting can really deal with those two problems since they're in the game design, so most games will be pretty poor when controlled by mouse.

Fan made patches however can improve both of those problems quite a lot, the game I tested the most MGS PW is very playable with a mouse by just tweaking my right analog aim patch to reduce deadzone and heavily multiply speed with it's speed control addon. So using mouse in PSP games isn't entirely a case for weird people wanting to try weird stuff, it just requires lots of community effort to really go anywhere else. Kind of like 60fps patches, potentially more time consuming, but at least imo - less buggy.