Determining which module to load with Matchbox modules

[eluser]PeteZahut[/eluser]
Suppose you have this url: http://www.somedomain.com/somename/

I'd like to determine which matchbox-module to load based on the "somename" segment. The segment is checked against the database where the type is pulled:

"select type from content where uri = 'somename'"

if the type is "page", go to the page-module and load "show_page" with seg 1 as value
if the type is "form", go to the form-module and load "show_form" with seg 1 as value
if the type is "module", go to the module using the name in segment 1 and load "index"

I know you can achieve this with custom routes, but how can this be achieved without specifying the custom routes?