Please be aware that Intel SRT is not supported under Win 10 at this point. My recommendation at this point is to check with Dell directly and confirm if they have any step to install and make the Intel SRT work under win 10.
Thanks Kevin for your reply, and yes, I probably should check with Dell, but wanted to get an Intel point of view on this as its Intel tech, and Dell so far has not been able to answer me.
As mentioned, I can get it working on Win10, even with the 2013 software, so I could just leave it as is, but of course if its not meant to be working on Win10, then I would rather remove it and avoid any unforeseen issues.
So being more specific, I can easily do a clean install, should I enable rapid start, so not. Doing so will also free up 16GB of space which is currently partitioned for IRST, so if there are really no benefits to having IRST, I would prefer to leave it out.