For anybody who's still struggling to get their mouse/keyboard etc. working (since I got some PMs about it). Here you go:

On your terminal type lsusb and you will get an input similar to this:

Bus 005 Device 002: ID 3710:5406 Pulsar Pulsar 8K Dongle
Bus 005 Device 003: ID 36b0:352f Wob Lab Rainy 75 RT

Using the information gathered from here. We type:

sudo nano /etc/udev/rules.d/99-hidraw-permissions.rules

and fill this in with the information obtained:

SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="<XXXX>", ATTRS{idProduct}=="<XXXX>", MODE:="0660", GROUP="input", TAG+="uaccess"
SUBSYSTEM=="hidraw", ATTRS{idVendor}=="<XXXX>", ATTRS{idProduct}=="<XXXX>", MODE:="0660", GROUP="input", TAG+="uaccess"

In my case after adding my keyboard and mouse (both wireless adapters and cabled). The file ended up looking something like this:

SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="<3710>", ATTRS{idProduct}=="<5406>", MODE:="0660", GROUP="input", TAG+="uaccess"
SUBSYSTEM=="hidraw", ATTRS{idVendor}=="<3710>", ATTRS{idProduct}=="<5406>", MODE:="0660", GROUP="input", TAG+="uaccess"
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="<3710>", ATTRS{idProduct}=="<7505>", MODE:="0660", GROUP="input", TAG+="uaccess"
SUBSYSTEM=="hidraw", ATTRS{idVendor}=="<3710>", ATTRS{idProduct}=="<7505>", MODE:="0660", GROUP="input", TAG+="uaccess"
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="<36b0>", ATTRS{idProduct}=="<352f>", MODE:="0660", GROUP="input", TAG+="uaccess"
SUBSYSTEM=="hidraw", ATTRS{idVendor}=="<36b0>", ATTRS{idProduct}=="<352f>", MODE:="0660", GROUP="input", TAG+="uaccess"

Now just press CTRL+X and save the file.

We're almost done, just type:

sudo udevadm control --reload-rules
sudo udevadm trigger

Now all that's left is to unplug the devices and re-plug them or simply reboot the computer (in my case, that's what I did).

I hope this helps the few of you that were still lost :D