The entries in onlinemedia.xml are ordered alphabetically by the stream url which is useless in most cases since they are often numeric or dont relate with the stream name.
It would just make sense if they were ordered either by stream name or by the same order that they have in the onlinemedia.xml, please change that.

Here is an example, assuming these are the entries of the onlinemedia.xml:

This is the order how they would be shown now in WiiMC, first ascending numbers and then letters of the stream url:
Radio 3 (->..ttp://01.0..)
Radio A (->..ttp://02.0..)
Radio C (->..ttp://03.0..)
Radio B (->..stream-url-x:9..)
Radio 2 (->..stream-url-y:9..)
Radio 1 (->..stream-url-z:9..)

And now here is my suggestion how it should be (if it is technical possible), first ascending numbers and then letters of the stream name:
Radio 1 (->independent from url)
Radio 2
Radio 3
Radio A
Radio B
Radio C

Or just the same order as in onlinmedia.xml. in this case:
Radio A
Radio B
Radio C
Radio 1
Radio 2
Radio 3

In my opinion this would make the navigation through a customized onlinemedia.xml with many entries much more comfortable.
I have attached as a practical example an onlinemedia.xml which contains alle streams from Digitally Imported (di.fm) which shows the problem clearly when its loaded in WiiMC.