Hello again Tobias - you're looking well ;0
I have a currency column which is sorting as text (eg $1, $100, $2, $200). I have tried injecting the "aoColumns": [null, null, null, { "sType": "numeric" } code & also { "sSortDataType": "dom-text", "sType": "numeric" } but it does a strange thing sorting the first row. I suspect it needs a plugin but I'm not sure how to implement this with your wp-Table-Reloaded... eg http://datatables.net/plug-ins/sorting#how_to_type
If a demo helps have a look at http://ibooknewzealand.com/category/activities/
(although I might have to take out the above code to get a working table before you look at it)
Kind Regards, Joan.