I don't know if there's a way to have "unlimited pals" on the fly or not... or an easy way for add ons to be included in the online config option (for placement).
I just put together the "birthday pal" which works with the birthday mod.
IIP is very user friendly (install wise). The easiest way for someone to add in and add-on like mine, or the photpost pal etc... is to simply rename it customboxpal1 or customboxpal2 etc.... Then they can choose it's position in the control panel without having to do any hacking.
I guess 3 should be enough... but it wasn't for me. I had to hard code the include in somewhere.
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I had to hard code the include in somewhere. 
