It would be very nice to see split screen. At times I have friends over and would like to play it with them.

Hmm.. would you connect two mice and keyboards to play in splitscreen?

The hack of coming up with splitscreen outside the game would be to start multiple RWRs, make one a server and join the others in the first. It is possible up to this point easily, had to add 1 line to make the windows keep updating rendering when out of focus.

Input handling is a problem though as only the focused window gets to handle the input. It might be possible to make OIS behave so that it captures the input regardless of the window being in focus or not, frankly I have no clue at this point. Having two mice could be a bigger issue though as there are some rumors DirectInput doesn't support multiple mice, but then again, the stuff I happened to read was from 2008.

Anyway, in-game splitscreen support will most definitely not happen, the amount of work compared to the demand for it wouldn't make any sense. I'll do the things I can to make it possible with multiple windows, but even then it's very low priority, and might not be possible at all if the mouse restriction is correct.

Okay thank you. If not by a mice, would a gamepad/360 controller be a possibility? Anyway thank you for looking into it.

I suppose so, yes. Currently the game neglects gamepad input, but it would be reasonably easy to enable through OIS, and there has been more than one request for it to be added.

I wouldn't want to be the one with the controller hehe, as with mouse+keyboard you will most likely be MUCH better than with a controller.

By saying gamepad control could be allowed, I'm not saying it would be recommended. I personally doubt if the crosshair can be handled well enough with a pad without gimmicks like auto-aim -- I could be wrong too here. If something like that needs to be added, then it can ruin online.

But, as enabling gamepad should be easy and it shouldn't show in any way to people not playing with gamepad, there's no harm to use an hour to get it up.

I actually tried this (with XPadder) and yes, aiming was kinda hard. Especially getting a deadzone/sensitivity setting right for both quick turns and fine aiming was difficult. I used a pretty shitty pad (I think it has a certain bit of "hardcoded" deadzone) though so I think I might try this again with a PS3 controller.
Gamepad stick + left side dpad and buttons for different stuff crouch/prone/reload + mouse for aiming was awesome though.

Another approach to this could be a shared screen (perhaps zoomed a bit out) like in all them lego games.

A shared screen would imply an in-game implementation for splitscreen, and that's just too much of hassle as the game was never designed for local co-op (multiple crosshairs, helpers, object inspectors, viewports, two inventory views, huds, two sets of squad markers, one or two map views, etc).

Yea and it would still probably need a ton of optimization as far as using gamepads are concerned.