After years of dealing with this issue I finally found a fix.
You need to download Synaptics Pointing Device Driver 19.5.19.28 for Windows 10 v1803 64-bit
It has to be that exact version.
Once you download it, it will be a .cab file. Extract it using winrar or 7zip or whatever.
Once that's done, install the driver as your Synaptics Pointing Device by doing this: Right click each individual .INF file in the extracted .cab folder (the folder should be named something like "ea10cb2d-3433-48cb-ba3a-b487acb7c014_ea74f9717ecb9763af8dd7eb8bf3dacd64c8ac6a" unless you or your extraction program renamed it) and click "install" for each INF file. After that, then go to Device Manager and right click on "Synaptics Pointing Device" under "Mice and other pointing devices". Choose "Update drivers" and then "browse my computer for drivers". Choose "Let me pick from a list of available drivers on my computer" and then "have disk". Then point the file browser to your extracted .cab folder and select your INFs from there. Windows will complain about you having a newer driver but ignore that and force install 19.5.19.28.
Once the driver is installed (you may have to reboot before doing the following, I don't remember), here is where we finally unlock our TrackPoint sensitivity options for the T25:
Go to the extracted cab folder again. There are two files with the .appx extensions (SynUWPCPL_19005.19028.0.0_x64.appx and SynUWPStickCPL_19005.19028.0.0_x64.appx). Do the following to each .appx file, individually:
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The certificate used to sign the Synaptics app installer is expired as of August 4, 2018.
You can still install if you do this:
Right click the *.appx installer file and select Properties.
Go to Digital Signatures tab.
Select the certificate in the list and click Details.
Click the View Certificate button.
Click Install Certificate button near the bottom.
Select Local Machine in the Certificate Import Wizard and click next.
Select Place all Certificates in the Following Store and click Browse.
Select Trusted Root Certification Authorities and press OK.
Click next, then Finish.
OK out of all the dialog boxes and try to install again.
Again, do that for both .appx files.
Once that's done, reboot. Now you will have a TrackPoint option in the Windows 10 "metro" style settings menu where you can finally adjust the sensitivity of the TrackPoint again!
And it actually works. It's not a placebo. Which makes Lenovo hiding the feature that much more strange.
After you do this, you might want to enable a group policy to dis-allow Windows 10 from updating your mouse drivers, ever. Because it will "overwrite" these. There's a lot of guides on how to do it; there's also a registry trick to block automatic updates for specific devices too.
Anyway enjoy the guide as I still love this laptop and I hope this helps someone else out there.