iFinity

The approach you have of creating the friendly Url and then deconstructing that in the siteurls.config file may work just fine.

However, as you know, you have to manually enter a rewrite rule for each different product.

The Url Master module cannot rewrite to module-specific rules, as there is no interface between the various modules and the Urls. There's no way for the Url Master module to know that 'productname1' means xmmid/1478 etc. So the rules have to be defined somewhere else.

The Urls will work OK - as in they won't break anything- but for module specific rewrites you need module specific rules somewhere.