For the time being - @RobinC I do that with a Lua function:
function handle_slider (valueObject, value)
local control = valueObject:getControl()
local id = control:getId()
local channel = id % 6
local pitch = math.floor( (value * 16383)/100 ) - 8192
midi.sendPitchBend (PORT_1, channel, pitch)
end
Then assign handle_slider
to a virtual parameter slider set values 0 to 100. Maybe this can help you.