I had look at the Mini boards as posted by Egon. It looks like he did some modifications to the layout and added a header to connect external leds on the 22b boards.
I do not have a mini, but it looks like the spacing is such that you can solder a pin header in there and then use a ribbon connector to plug in. The other end can the be connected to Leds. Yes, I will not solder directly to the board, but use a header.
The header does provide both +3.3v with a load resister and gnd. See schematic.
I would use the lowest current draw led's I can get, as normally each led has it own load resister.
Dries
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