Now the touchscreen sound is back, iconified 'SystemUI root window' is gone but with it the info dialog while locking/unlocking touchscreen is also gone(I think its better than having these iconified things appearing all over the panel).
*not stopping the multimediad preserves touch sounds.
*stopping osso-systemui and osso-systemui-early avoids multiple and automatic appearance of iconified 'SystemUI root window'.
*More stoppable services:
- osso-applet-display
- osso-systemui
- osso-systemui-early
Also as I don't thing I'll be using bluetooth and maemo-map:
- bluez-utils
- btcond
- gpsdriver
- libgpsbt

Btw, thanks sjgadsby! it did the job.. now I can access email esp. to check my gmail, its easier this way.