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You can use a keyboard, there's no real reason to use a mouse as you just hit enter to start typing and then enter again to send or esc to leave the text chat box.
You can use a wired keyboard and some Bluetooth ones. It's plug and play for the wired ones.
PS4/EU
CP-1300+
PSN - LookoutLuke
15 Max level toons
PVE/PVP
Due to PS4 only having two USB slots, as the PS4 uses bluetooth I recommend a bluetooth keyboard. I picked up a small Logitech one on the weekend which can also connect to mobile phones, tablets and laptops - works a treat on the PS4. Definitely no need for a mouse.
Australian on PS4 NA server.
Everyone's entitled to an opinion.