Yes it is possible using the IOL technique in grid edit mode. You have to monkey patch the function GeditSubmit(). The jax.params will contain a string of XML in this format which represents the changes made:
<qdbapi>
<geRidListStr2000>1~~!~^3~~!~^4~~!~^5~~!~^6~~!~^2~~!~^-10~~!~^-11~~!~^-12~~!~^-13</geRidListStr2000>
<geDFID2000>0</geDFID2000>
<geDBID2000>bk8f9xcs8</geDBID2000>
<geOldRidListID2000>3775</geOldRidListID2000>
<geDoneURLID2000>112</geDoneURLID2000>
<gridData2000>t~~!~^4~~!~^6~~!~^e~~!~^2\nt~~!~^5~~!~^6~~!~^x~~!~^3\nt~~!~^2~~!~^7~~!~^s~~!~^4\n</gridData2000>
</qdbapi>
Believe it or not, all the grid edit changes are encoded within this XML which can be parsed with script and changes logged to additional fields via AJAX calls.
