You obviously need to distribute the sample files along with the plugin / standalone binaries, as they will get streamed from the disk. I highly recommend converting your samples to HLAC monoliths before distribution as this improves both performance, file size, memory consumption and convenience. I've been working on an sample archiver built into HISE that compresses all HLAC monoliths to FLAC format (which gives another 20% - 30% compression ratio) and splits the archive into chunks of 500MB for better downloading. I'll also create a "Sample Installer Application", which can be distributed along your binaries, which extracts the samples from the archive and creates all necessary file links.
You just have to install the IPP library with the installer from Intel after you registered there (for free).
You can connect SliderPacks on your GUI interface to a SliderPack of any module, but this feature is still a bit experimental (I am using it for a current project, but I have to clean a few inconsistencies before recommending it to use by other people.
I'll take a look, but it's possible that my loop-point importer is not as robust as it should be (it worked for my samples in the past, but there is no hard standardisation for loop point definition so there are many edge cases).
Custom filters using scripting is a bit difficult, because the overhead of the scripting engine starts to play a role for polyphonic materials, but I am thinking about a different way of adding additional filter algorithms to the current HISE filter.
The font goes in the images folder. You need to use the loadFont command in your front interface script to include it with the instrument. Make sure you own the license to use the font or that it is royalty free or similar :)