You are quite right. We will make these changes to web.config file, so the handlers become active for HEAD as well. We will most probably make them active for any verbs, just like the ones in Integrated Pipeline mode. This will be good for the SEO, since some of the crawlers do HEAD first in order to check how old the items are, then proceed with the index (with GET).
As for the ScriptResource - the situation is the same :) :
<add verb="GET,HEAD" path="ScriptResource.axd"
We have updated your Telerik account with some points, thank you for bringing this!
the Telerik team