Given the screenshot you posted and your comment about the usefulness of a ClassTimer feature, I am guessing that your profile, which says "no WoW account," is a blatant lie. This needs to be fixed before the next time you post.
(edit) I note that you edited your profile to link to a level 65 druid. If this is your actual main character, I expect a PM explaining why you're commenting in a rogue UI thread and have a handy screenshot of a rogue UI available to post.
Originally Posted by Paxer
...I also use ClassTimers for cheap shot, kidney, blind, etc. in pvp and I find that with these shorter duration abilities that this is less of a problem because the bar speed is far more noticable....So whilst I am still searching for the perfect timer, I would put forward the suggestion that bar size being linked to actual duration rather than percentage of initial duration is very good for our primary PVE finishers.
I thought I would mention to you that while Classtimers will not scale bar length as you specify, it can be configured to order bars by time: example here(in red square) showing duration top to bottom. I personally find this useful as I can see bars nearing the end of their duration at a glance. However I can see some people preferring static placed bars in order not to 'search' for information (even though this setup does the searching for you, in a way.)
If bar length is absolutely your thing, I suggest you try event horizon posted by Vulajin. Its timeline-like bars may fit your needs.