Linear hotbars and cross hotbars are different bars with different uses and taking the time to program an option to make them look good together would be a poor dev investment. If you're just using a hotbar as a cooldown tracker and you need it to be pretty, you should find a way to make it pretty using the existing options.
Ten. Any of the linear hotbars can be configured to be horizontal or vertical, or wrapped into 2 to 6 rows.