As for the bard types, I have no idea, except using the sneak ability that all scout classes get. and yes that is possible. Especially if your in a group you can sneak again. However, I am now an Assasin, and since this topic came up I thought I would offer a few tips to other Assasins, younger Predators and/or the other scout classes if they apply. So here goes.
MACROS!! MAKE MACROS!!
Earlier one of the posters was talking about using Shrouded Strike which he has to click off attack so he starts sneaking, then he can use Cut Throat or any other ability that requires you to be sneaking. I use this combo a lot, except its a one click job and its automatic. Macros have 3 lines, here are my 3 lines
/useability shrouded strike
/toggleautoattack
/useability cut throat
One click and I get two attacks that happen back to back because it cues the Cut Throat ability right away. Another one I use is Stalk and Elaa's Relentless Ambush (I think thats what the full name is, not 100% though) and its the same setup as the previous one I showed you, again, one click, and I perform two manuevers with devastating effectiveness. another idea, for those who have a hard time with agro, try this one,
/toggleautoattack
/useability evade
/useability stalk
Both Evade and Stalk reduce hate, plus Stalk puts you in sneak mode and sets you up for a big attack. One last idea for a macro which I mentioned in another post, macro your HO's, its easy and fast, I get off more HO's without interruption because it goes so fast when it is macroed, and its only one click.
With these macros, i save time, get off a lot of damage and I have more room for more buttons on my hotbars. I hope this helps, and good luck out there.