I just add my five cents to demonstrate that this need has multiple users :)
I would love name, or label, for decision too, I believe it's easier/faster to read/understand, if you separate question and answer (eg name of decision and guard on/of flow), than having to put everything into guards .. there's also some redundancy in writing, since you're forced to repeat the "verb" on each outgoing flow..
especially when using activity diagram to document some low level implementation, for example getting some values from database and deciding upon the number of records returned .. eg something like 'found more than 1 item', 'found one item', 'found none' .. on the low level implmementation you usually need to have all details (parameters for query, for example), meaning you want to have the rest of diagram as simple as possible, and having the name on decision helps that :)
thanks,
J.
ps: I know I can simulate that with arbitrary text to the element, but you have to attach it with note-link, otherwise you will loose it upon the first reorganization/repositioning of the diagram elements .. therefore it's cumbersome and flawed :)