Finally it worked for me allso

What i did was start up the bme script, plug in flashstick when 'starting bme' showed (no light in my flashstick at this point), waited to 'connect usb now' showed and waited about 5 secs, then unpluged and repluged the flashstick and now the light blimped on the flashstick, then checked in xterm: ls /dev/sd* and got /dev/sda + /dev/sda1, then pushed mount /dev/sda1 in bme ui... And there it was the flashstick in the N900 file browser

Thanks to all the devs and the ones posting there experience and tips in this thread

Here's my sylog (flashstick)...
Syslog.zip

e: Just did it with a external HDD powered by a netbook (i know not that OTG lol) and didn't need to unplug/replug to make it work