ndrosis (http://www.dolibarr.org/forum/12-howto--help/23108-delete-disabled-because-can-not-be-erased#23109) told me, that we can make a lot of settings according to this wiki page: http://wiki.dolibarr.org/index.php/Setup_Other
In this case, the setting
MAIN_DISABLE_PDF_AUTOUPDATE = 1
=> Disable automatic generation of PDF each time we add/update/delete a product line (we can still build document by clicking on "Generate"). This option may increase interface speed on server with low CPU.
works fantastic. Exactly what I wanted.
Problem solved!
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