Quote:

Leave off the 4; just call it Asus.






Yes, but it shouldn't work that way.
I've mentioned this before . . .

There are two types of suspended chords ... a sus2 and a sus4.
By only accepting "Asus" BiaB is assuming there is only one type of suspended chord.

If one types in "Asus2," BiaB enters A2, which is a different chord!

A2 is an A triad with the second (B) added.
Asus2 is the second replacing the third (C or C#).

A big difference and a big failing in my opinion on BiaB's part.
Unless there is some way to get around this that I'm not aware of.