F5 Sharepoint workflow integration

you seem to be already on this issue for a while: https://devcentral.f5.com/questions/load-balance-microsoft-workflow-10-servers-for-sharepoint-2013

little other questions exist, so it is either never done or quite easy.

this sharepoint guide doesn't mention it at all, so it doesn't appear to be very common: https://www.f5.com/pdf/deployment-guides/iapp-sharepoint-2010-2013-dg.pdf

this 3rd party blog does seem to indicate it should be possible: http://www.harbar.net/articles/wfm1.aspx

have you considered talking to your F5 SE, F5 professional services your F5 partner about this? it seems it is more complicated then expected and probably someone on site to help out and do some investigating which is difficult via a website like this.