What are the disadvantages in reuse_alv_fieldcatalog_merge

hi
what are the disadvantages in reuse_alv_fieldcatalog_merge.
by using this can we create any number of field headings? is there no limit? explain in detail?

1. reuse_alv_fieldcatalog_merge have many lititations such as you can not change the sequences of tha column. Suppose in table the fields are f1,f2,f3,f4 and f5. But in display i want the sequesce say f3,f4,f2,f1,f5. Using the fm reuse_alv_fieldcatalog_merge is not possible. But you can do it by manually process by passing the sequence in col_pos field of the fieldcatalog.
2. Similarly you can give the column length as you wish by 'outputlen' paramater of fieldcatalog.
3.  you can give the column heading of your own by seltext_m, seltext_l, seltext_s paramater of fieldcatalog. 
4. You can make a field hotspot by hotspot parameter of fieldcatalog.
5. you can emphasize a field by emphasize parameter of fieldcatalog.
6. You can display the sum of a field by do_sum parameters of fieldcatalog.
there are many more functionality which you can not get by FM  reuse_alv_fieldcatalog_merge.
What you can do is that use both the FM to filled the functionality of the fieldcatalog  what you get autometically from the reuse_alv_fieldcatalog_merge and for the rest of the functinality you can add the functionality by manually append the fieldcalatog. It is call semi autometic fieldcatalog built.

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