Since such a tool is requested very often, I just have written a small C application which does the same.
It consists of one rotary encoder for BPM, and 5 buttons for Stop/Pause/Play/Rew/Fwd and a 2x16 display
Tomorrow I will add the possibility to send a song positon pointer (therefore the Rew/Fwd button), thereafter it will be released in the “MIOS Toy of the Week” section