@alexxx I believe the Using joystick message is the joystick information SDL reports to DOSBox. For my PS3 controller, I get the following:
Using joystick Sony PLAYSTATION(R)3 Controller with 27 axes, 19 buttons and 0 hat(s)
I do also get the following message which confirms my joysticktype setting.
One joystick reported, initializing with 4axis
I have checked the dosbox-SVN.conf file and the 2axis setting allows support for two joysticks.