I have Epson L355 printer that can connect to wi-fi router via WPS or SES (don't know what it is) only. I don't want to replace my RG951G-2hnd to some other only because I cannot connect printer to wi-fi. I beg you to add such functionality and I'm ready to do beta testing as soon as possible.
to use WPS you need cm2 package enabled in RouterOS v6.25. Then in Wireless settings you need to enable WPS. Older devices don't have a easy to use button, so you will have to use the Virtual buton in Quickset.
Windows laptop will see that there is a protected AP which offers WPS. When WPS is chosen, the Windows laptop will ask you to go and push the WPS button (either on the device, or in QuickSet). This allows to connect to a protected AP without knowing the password.