No problem
You can technically control the character via the keyboard & a little bit of Lua script, but there's currently no simple way of going about it.
About all you can manage so far is scrolling scene up/down & make it shake with the earthquake feature but it lacks precise control. It would be nice if we could control the force & speed for both x & y.
I don't really know too much about AGS, to specify on how they achieved what they did.