Customize "Model properties" information

Hi all, I've a simple (I hope) question. In my *.mdl files I use the "Model Info" block to Display revision control information in model (e.g. who is the model creator or model version). At moment this fields are update via "macro" (<Creator> or ModelVersion) added from "Model properties " list. Now I would use my customized information to fill the fields above. The idea is to set custom global variables with *.m script and use this information in "Model Info" block instead of macro. I've tried to define a global variable and use It inside "Model Info" block without success, because inside the block seems is not possible show information different from the informations defined in "Model properties " list. Any suggestion ? Is possible overwrite the value of "Model properties "? Thanks!