You can remove IE7 limitation in Graffito template by editing the following file
/templates/rt_graffito/features/ie7splash.php
Find the following codeif (JRequest::getString('tmpl')!='unsupported' && $gantry->browser->name == 'ie' && $gantry->browser->shortversion == '7') {
Change it to (for example)if (JRequest::getString('tmpl')!='unsupported' && $gantry->browser->name == 'ie' && $gantry->browser->shortversion == '6') {
That will remove IE7 limitation but you have to know that you will have to work with css to adjust it to IE7. Please don't ask for a support here regarding this part because it represents big customization and this forum can't provide such service