I have been testing a lot with the win3.1 and the mouse and my changes on settings are:
autolock=false (to can close dosbox when it stucks)
sensitivity=107 (works perfect when first you drag your mouse on upper-left corner of the window! not of the maemo os!)
windowresolution=760x420 (i know 800x420 is the best but if you want more normal mouse you low the resolution for the limits of the window
core=normal( auto tries to dynamic so as i have seen the windows are more slower than normal)
fulldouble=true (loads more faster but you maybe see the lag of the picture)
frameskip=1 (i think its more normal than 3, also 3 loads more faster ! but i think that will be pain on the controlling of the mouse cursor)
Also in the Win3.1 go to control panel -> mouse->
and set the sensitivity to lowest!
