From Alexandra Popova, Product Manager for SDL:
Hi Manoj,
This checkbox makes perfects sense since the list of Target Languages can be pretty big. The feature has been already requested (registered as an Enhancement Request) but was not yet implemented.
There is a possibility to create a plugin that will set checkboxes to unchecked when the screen is loaded. Plugin can be also coded to selectively check some publications and not others (based tcmuri). There is a hotfix (Test Track #82766) that needs to be applied prior to plugin - please check with SDL Support if you are interested.
BTW I see your publication names do not show up properly for Chinese (PRC) for example: there is a workaround for this issue:
The width of a column can be changed in TranslationJob.aspx - the table with ID TargetsTable. Notice that any changes made will obviously be overwritten by any new hotfix/version delivered by us so it's not fully supported changing it:) Also notice IIS reset is needed as IIS caches the compiled ASPX file.