Not all people has MMC. So MyDocs will be better choice.

For temporary solution you can create symlink from /opt/stratagus to MyDocs (and move folder) after installing Stratagus and Games...

But there is problem with dpkg and FAT32. FAT32 does not support linux access rights. So when I create DEB package which can install file to MyDocs dpkg fail with error: Cannot change permitions (in MyDocs) :-(

If somebody has found solution how to create DEB package which will install files to MyDocs (on FAT32), no problem I will change it...