Make it so that you can change equipped weapons (I always thought this would help archers) after attacking/moving/etc. and give archers knives. Rebalance knives so that they aren't useless (but don't make them overpowered). Mages should get knives and staves always, since they are pretty useless with a knife. I would argue against this if staves could counter attack like in RD and attack like Gandalf. Also 1-2 knives.
If re-equipping is too broken than you could add a skill that allows this (give it to Rolf) and add another skill scroll.
Stiletto being effective against armors is useless, especially for mages because they already attack res which is always lower than def. Thieves and Volke should be able to use swords as well.
I don't think Rolf needs a buff exactly, because honestly he ends up pretty good. He has uber def too.