This is a quite popular plugin lately. Maybe someone will find it useful with a bigger preview - then replace the curve-bend.exe file with the downloaded file (\lib\gimp\2.0\plug-ins\curve-bend\).
Remember to archive the original plugin.

In the original file curve-bend.c only the following changes were made:
from (line 79-82):


to:

... although for those using max bend this version will be better (proportional enlargement x2)

Thank you MareroQ for the update.