[Orgmode] getting rid of file level in clocktable?

[peter . frings]

Hi all,

I have the following clocktable:

#+BEGIN: clocktable :maxlevel 4  :scope agenda :block thisweek :step  
week

Weekly report starting on: <2008-08-04 Mon>
| File           | L |  
Headline                                         |    Time |        
|       |      |
|----------------+--- 
+--------------------------------------------------+---------+------- 
+-------+------|
|                |   | *Total  
time*                                     | *35:36* |       |        
|      |
|----------------+--- 
+--------------------------------------------------+---------+------- 
+-------+------|
| planning.org   |   | *File  
time*                                      | *19:41* |       |        
|      |
| planning.org   | 1 | xx yy: REQD        
(G1005001)                     |   19:41 |       |       |      |
| planning.org   | 2 | xx  
zz                                            |         | 19:41  
|       |      |
...
|----------------+--- 
+--------------------------------------------------+---------+------- 
+-------+------|
| notes.org      |   | *File  
time*                                      |  *0:15* |       |        
|      |
| notes.org      | 1 |  
Todo                                             |    0:15 |        
|       |      |
| notes.org      | 2 | verify which  
colors                              |         |  0:15 |       |      |
...
|----------------+--- 
+--------------------------------------------------+---------+------- 
+-------+------|
| time-sheet.org |   | *File  
time*                                      | *15:40* |       |        
|      |
| time-sheet.org | 1 | xx yy: REQD      
(G1005001)                       |    9:26 |       |       |      |
| time-sheet.org | 2 | xx  
zz|                                           |         |  4:17  
|       |      |
...
#+END:

However, I would rather omit the file level, and thus have 1) no  
'File' column nor *File Time* rows, and 2) group the same entries  
across different files in the same summary entry.

I could of course reorganize the setup and put everything in a single  
file, but this system now works reasonably well for me. I'd rather not  
change it too much.

I have searched the documentation and googled hard, but found no  
[obvious] solution. And my elisp skills are nearly non-existant... Is  
there any kind and smart soul that knows how to tackle this?

Thanks,
Peter.