Chapter Master Helbrecht has some cool functions on the table, but because his ability is a once per game thing, so it requires some skill in positioning units. He essentially allows all black Templars to have fleet and hatred for one turn, whic if used well enough, can win games when paired with their chapter tactics. I've never been able to make him work well but I roll terribly when it comes to assault charges. As far as putting neophytes in Crusader squads, I do it myself regularly. I take groups of 20 guys with a power fist and a melta gun and run em on foot. If I want to run them in a Crusader I take 15 man squads. In a drop pod or rhino I take 1 sword brother, 4 initiates and 4 neophytes. This load out is usually taken with a melta gun and a gravcannon. Good shooting unit with bolters and shotguns.
Now, something I've seen work surprisingly well is to take Helbrecht with a squad of scouts. They're a cheap unit that can take casualties, make the chapter tactics work, and the scouts Move Through Cover special rule allows more instances of Helbrecht closing the gap and getting into combat. Also forgot to mention Helbrecht's sword gives d3 attacks on the charge and actually stacks with rage, so you can potentially clean up an entire unit on the charge with him.
Few things I've learned over the years, not to forget. Templars all have Crusader, which allows better roll averages for running as well as +d3 on sweeping advance moves. That extra d3 has allowed me to wipe units of slaanesh cults, as well as some unlucky Eldar units on sweeping advances. Neat little over looked asset.
On the subject of dreadnoughts, there are several schools of thought but personally I like either an ironclad with two close combat weapons, bare bones in squads of 3 on foot, and venerable with lascannon and missile launcher. Ironclad has the seismic hammer, a dreadnought fist (I THINK they benefit from the +1 attack) and frag launchers. Ironclads can potentially knock over scary things like Imperial knights. The bare basic dreadnoughts in 3's are pretty much just a means to bun rush the field and hit hard for 100 pts per model. The venerable I like to make a heavy weapons platform because I feel taking advantage of the improved BS is better than the WS. You can shoot a gun and hit on 2's. Even with WS5 the best you can hit on in assault is a 3. Remember what I mentioned previously about Grimaldus and Helbrecht? Their special abilities can work in conjunction with dreadnoughts too, so while they by themselves really only benefit from the Crusader Special rule of their chapter tactics, Grimaldus can still give them zealot, and Helbrecht can give them hatred and fleet.
Anything else you curious about?