as I noticed some differences as well when trying to create Web20 at full throttle compared to a reduced thread number i thought a "safe mode" might be a usefull feature.
i'm not exactly sure how the safe mode should be defined though. maybe when changing it to that statut then SER will only use up to 10 threads, but less threads if only 6 working proxies available (then 6 threads). html timeout settings could be increased to 180 seconds. maybe all proxies will be checked before submitting.
when safe mode is in use then all "non-safe-mode" projects will go in pause mode or inactive.
a simple status change would ensure that we don't have to change some settings every time when trying to get best results for Web20s.