Standardise height of custom field controls

Many of the custom field controls are different in height. (E.g. a drop down list control is a few pixels taller than a single line text box).

Apart from looking scrappy, this makes multi-row matrixes in custom forms confusing, because the controls become mis-aligned.

Would it be possible to make all custom field controls the same height?

Alternatively, this problem could be solved by the implementation of idea AM-I-293: "Table Custom Field Control" (https://ideas.avinet.com.au/ideas/AM-I-293).