I don't think so.
php suexec deamon mode comes out for better utilizing shared memory. it works quite well in many servers so far so long. but it may have problem in some cases -- but you have to submit a bug report accurately. you can't draw such a big conclusion --- "php suexec deamon mode is not very compatible with php modules that use shm memory". it may due to xcache's issue, or simply xcache's config issue, or php internal bug, or really due to litespeed's php suexec daemon mode. to identify the issue, need reproduce the issue reliably first. just like other software/hardware bugs.