I have spoken to TP chat support, probably they know less than me, seriously. Her advice was to send an email one of them engineer. I'm waiting for the answer now.
Unforutanely my drop is realy high. Without control my download speed is ~70.00 Mbps and the upload is ~18.00 Mpbs, with the control even without rules or withit my d: ~ 36 Mbps u: ~14 Mpbs.
I'm afraid this is some kind of feature when you enable the control, instantly split the line or something like this i have no idea.
Btw thx u're keep trying.
Edit: The rules are working perfectly when i setup less speed than 36 Mbps.
Not as a pure modem, no. You can turn off DHCP and wireless but it will still be routing and natting and carrying out the PPP functionality.
As an aside, despite having a TD-W9980 myself, I would no longer recommend it. It is now obsolete and has become quite expensive and possibly will not have a firmware upgrade that would be required for it to work on IPv6. The newer VR600 would be a better option.