I opened a case with Dell and after several hours on the phone requested an escalation. I received that escalation today in the form of a call from Brad. He was able to narrow the issue down to a driver version right away and I can confirm that if you block the drivers from Windows Update in Windows 10 and downgrade your driver from Alps 10.1207.101.113 to 10.1207.101.103, the functionality is returned. Be aware that there might be bugs in the older driver, but in my 5 minutes of testing it worked great! As time allows I hope to test other versions of the driver, but getting it working is a huge step forward. You'll have to go to downloads.dell.com/.../latitude-e5470-laptop.html to find the older driver fastest (search for "Touchpad Driver" or the version number listed above). Hoping to hear back from Brad on what they found and am hopeful a fixed driver will be available soon.
Hi guys, I have an E5470 with a fresh install of Windows 10 Pro N and the latest Alps touchpad driver and I am unable to two finger tap to right click. To be fair, if I rapidly two finger tap about 10 times I get a right click window pop up however shy of that it just doesn't work. Its occurred despite reinstalling Windows x2. The problem goes away if I use the default Windows touchpad driver. Does anyone have any clues as how to solve this? Its rather annoying. 
E5470 can't two finger tap to right click?