You probably need to install additional ttf fonts to make stuff look ok in wine. Suppose some ubuntu forum can help with that. Personally I don't have battery2, but tried loading v3 in a project and can't reproduce. Managed to hang all of reaper though while playing the snare real fast on the trigger...
In my experience the NI stuff isn't all that good in wine. Some of it works fine, some of it so and so, and some of it not good at all.
You might wanna try to bridge/firewall the plugins (see: plugins->compatibility settings). That way a crashing plugin can't kill the host, does come with some overhead though.
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Reaper for Linux Documentation (WIP). Software: Archlinux/KDE, Fabfilter FX, Komplete 8, Nebula, Schwa/Stillwell, T-racks Max/Amplitube/SVX, etc. Gear: i7-2600k/4700HQ/16GB, RME Multiface/Babyface, Behringer X32, Genelec 8040, etc. :)