Title H2 resizing problem

Hi,
am i the only one to have so much issue with title H1 --> H6 font size ?
If you let the default size, so no problem, but if you want to customize the size of the font it becomes a paint...
I made a video to explain but it's difficult :
- each time i customize a font size when i select a title like H2, trying to resize it is hard, it doesn't keep the size.
- after resizing all h2 title clicking to a text area and typing "delete" remove all custom font size for title h2 :s
I thought the problem was with the website, but after testing i have this problem on all my install of EasyBlog.
http://snap.ashampoo.com/amxymMcNejBCxoFnsQXlEkAX9IWtYxaYEXsQfu0j7bLVPRDCd3NigoAFxXzrqzKU
The first seconds on the video show what happen when i type "delete"
Resizing the H2 tag is really needed like most of time the H2 size font is more high than H1 size on website.
Btw, why not planning a default size option for the title in admin area ?

Another problem i don't understand how we can do without it, is a block "white space", to integrate some white space between element
Thanks for your feedback