Total Commander

I use oftentimes the search function to search the whole directory tree for files containing a certain pattern.

Whenever I call search function the dialog shows a predefined minimum size of 64k.
Since I want to find ALL files I always have to manually change it to 0

Is there a way to automatically set this value to 0?

The result list shows (oftentimes) files in TotalCommander cache.
How can I always automatically exclude TC cache from result list?

The search pattern must be include in stars like
*foobar*
Is there a way to disable this requirement?
When I enter "foobar" then automatically internally TC should treat it as *foobar*

Last question:
When I tap on the loupe icon in initial TC page then TC tells me:

Find Files
Root:
Function not supported

How can I set
/storage/emulated/0
as default start dir (for recursive search)?

Is there a way to automatically set this value to 0?

No, unfortunately not.

The search pattern must be include in stars like
*foobar*

No, foobar alone will find names containing it. The only case when you need to use * is when the search text contains one or more dots.

How can I set
/storage/emulated/0
as default start dir (for recursive search)?

You can't, the search always starts in the directory displayed in the active panel.