I personally think No-Damage mods should be allowed as long as its not abused. There are so many trolls/ bad drivers on this game, which means players who are trying to get around and do drops are being stopped due to being damaged all the time by being rammed. Yes it does take the realism away, but makes commuting around ETS so much easier.
If TMP could added the No-Damage mod into the 'Tab' menu, and make it a choice to use it; Or give it to players without a severe ban history. TMP will be able to run efficiently and smooth. People who will get rammed by trolls will now have to 'F7' which will cause trouble at services. Its probable that it will then lead to trolls blocking service entrances. The problem has been taken from one place, but will likely go to another.