Just looking at the URL-Rewrite module with a plan to POC wordpress MU and came accross a few things
1st
being the rule import does not like "RewriteBase BASE/" saying it is not supported,
Great, but it woudl be nice I could then manualy edit the generated XML rule set, so I can apply them, instead of having to Edit the source .htaccess and re-import the file
2nd
Involve the "[L]" last rule option on .htaccess
the import wizard XML preview correctly included the 'stopProcessing="true" ' setting, but having applied the rules, the ' stopProcessing="true" ' did not get applied to the imported rules
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-.*) $2 [L]
Became
<rule name="ImportedRule5" >
<match url="^([_0-9a-zA-Z-]+/)?(wp-.*)" ignoreCase="false" />
<action type="Rewrite" url="{R:2}" />
</rule>
NOT
<rule name="ImportedRule5" stopProcessing="true">
<match url="^([_0-9a-zA-Z-]+/)?(wp-.*)" ignoreCase="false" />
<action type="Rewrite" url="{R:2}" />
</rule>