Suffice to say that if you want staff attention the best way to get it is to send in a "support" ticket using the button on the top right hand corner of any admin side blog page during support hours. Monday-Friday 8-4PM.
IMHO and from the individual blogger's viewpoint the only useful purpose that tags could serve (whether or not the first letters of each one is or, is not capitalized) is to direct those using my blog's searchbox to my blog posts in that same blog.
As the tag strategy in place here at wordpress.com is to direct visitors off my blog to the global tag pages just as categories do, and as there is no means of managing tags or even knowing how many I have used and what they are, let alone, being able to edit them, I don't find the capitalization of the first letter issue to be well - important.
So, I'm wondering why you are so keen on having them in the first place, with or without capitalized first letters. Would you care to expand as to what useful purpose you think they serve on your blog?