WeRelate

If you haven't yet found WeRelate, check out the RUNCIMAN families that can be found there.
As it is a free, genealogy focused Wiki, you can contribute your own corrections and updates there.
Consider registering and uploading your own RUNCIMAN family, merging with the existing ones if necessary, to help build an excellent register of known RUNCIMANs.
Also keep an eye on (and add links to) the RUNCIMAN Surname page for links to/from assorted items of RUNCIMAN interest.
Easiest method of adding people is to create and submit a gedcom from your own genie program, with dates and sources, or else it will likely be rejected at the admin review prior to upload,
This is also an excellent way of auditing your own data as the errors and warnings as part of the gedcom validation process quickly show the more unlikely dates in your tree !
Links can be easily created to further information, eg in the DNA and One Name Study projects.

As the FAQs state, no pages will be created for living people, and any earlier than 1750 can be created manually, but not via gedcom.