PS3 ps3netsrv docker install to a NAS and newbie questions

[apa64]

I had a vacation week and spent it reading the forums and wikis - and successfully set up my old PS3 with Evilnat's CFW. It got some serious new life now - this awesome community has so much knowledge!

I set up the ps3netsrv in a not-very-powerful Synology DS216j NAS, running it in a Docker container. If someone else tries to do the same my notes and start scripts might help:
https://github.com/apa64/docker-ps3netsrv-nas

I'm running Evilnat CFW 4.91.2 and have installed multiMAN MOD v4.91 and webMAN MOD v1.47.47n. Mounting ISO images over LAN works great!

Some quite noob questions remain, I just couldn't find out answers for these:

1. Does the Evilnat CFW offer any user interface in XMB?
2. How to take a screenshot?
3. Can I install PKGs from ps3netsrv in mmCM/multiMAN or WebMAN-MOD or do I have to use a USB drive for those always?
4. Is it possible that multiMAN and WebMAN-MOD conflict? This video says it can happen:
   Can I get conflicts if I mount a different game from multiMAN and WebMAN without ejecting it in first?
5. Can I remove the WebMAN-MOD installer from the PS3 HDD after installing it?

Thanks! I'll save the QA flag and syscalls-disabling-questions to later, I'll try to find answers first myself.