For starters, the games support up to four buttons directly. If you want to map the two actions, that require two buttons to be held simultaneously (running and blocking), to a single button, just use the internal mapper of DOSBox (Ctrl + F1). So there's no need to use Joy2Key. Setting the option "timed=false" in the config was the right thing, btw.
Also make sure to calibrate your controller in the option menu (F3 in the title screen), depending on your controller, turning on the option "circularinput=true" in your conf file might be helpful here.
That should be all there's to do, both games run and control very well in DOSBox, Wrestlemania is a fantastic arcade conversion and the best home version there is!
My full-featured DOSBox SVN builds for Windows & Linux: Vanilla DOSBox and DOSBox ECE (Google Drive Mirror)