You just have to cheese it a little. If you activate No Reload and have one round on you it will go until interrupted but it's easy to get pulled out of it. You can't change weapons, drops weapons or change any mods on anything or it will go back to you not having ammo again but once you loot one round it will re enable it. kinda wonky but works for now, I just run around with the rocket launcher nuking everything in sight.
@MrAntiFun not even sure you are are checking this site anymore but when you get a chance can you looking into fixing this trainer all the cheats except one works. And the cheat that doesn't work is the Inf. Item/Ammo cheat.
*Also the devs changed the inventory system to weight based, so can you add a Inf. Weight cheat?