I think you misunderstood what I meant. I'll expound a little.
Basically, you can write custom power cards or feat lines, but I don't think they should try to say, integrate the math in to the system. For example, say you wanted to give a player an old school Frost Brand. Take a basic power card for a +3 magic sword, then write in the properties "Gain resist 10 fire while wielding. Additional +3 attack & damage bonus aganist creatures with Fire, Demon or Devil keyword". The math on the card for attack and damage displays the properties for the +3 sword. No math is done for the custom element.
For a feat, you can againt write in what you want a feat to do, but if you want to put in a feat for 'uber-fortitude' that gives a +4 bonus to Fort then it should be in text only, not bother with trying to have it reflect in the actual stat blocks.
Inherent bonuses, stat "rolling" and additional/fewer feats are basics also, even though I think divine boons were introduced to alleviate extra feat need.
All these I think are ones that will be in the builder that aren't already.
Yes and no. usually what you say is enough. It's just as the old CB did it. I personally like to have some more so that your custom powers have keywords, range and those "upper part stats" on the card. But it doesn't need to do the maths. but if they'll integrate the CB wit hthe VT this'll become a major drawback, so they really need to integrate the math at some point, but not now. Or maybe this is the reason why they didn't integrate it and they never will?
I had to check this out myself as I didn't actually believe it. Sadly it is true that even if I select 'home campaign' I cannot use things like Themes or those psionic powers for Dark Sun. This is just stupid.
It's seldom to find people that actually pick up things from a discussion and basically change their opinion. Much appreciated.