[TYPO3-mvc] Never really understood tx_extbase_core_bootstrap and switchableControllerActions

[g4-lisz at tonarchiv.ch]

Say I include in TS some output of an extension:

         10 = USER_INT
         10 {
           userFunc = tx_extbase_core_bootstrap->run
           extensionName = Hplusinfo
           pluginName = Fe_search_fulltext
           controller = Search
           action = fulltext
         }

Like this I get the output of action = fulltext.
But when I change action = results, then I still get the output of action = fulltext... I.e. "action = " is ignored. I always 
get the default action of my plugin.

Isn't there a way to tell the bootstrapper what action he should run?

I know there is this "switchableControllerActions" , but I don't really understand it's meaning. OK I can overwrite the default 
action and controller. But actually I don't want to overwrite the defaults - I want to choose, which controller/action should be 
run. How can I do this?

I'm using T3 4.7 btw.

Cheers,
Till