My thoughts on your questions:
1. An offline client, allowing you to play campaigns against bots
Yes, that would interest me a lot. I really enjoyed the old campaign.
2. A bot with a setting for different play styles
Yes, I think this would be very beneficial. I play against bots most of the time and this would engage me more.
3. A strong bot.
Yes, for similar reasons, as above.
4. Options for timed games
N/A, not on my personal list of priorities.
5. Options for undo settings
No, don't really care here.
6. Online mini-tournaments; the option to easily create one for you & your friends.
No, I mostly again play against bots.
7. Option to invite specific players to your table
No, I mostly again play against bots.
8. More translations (to what language?)
No, English is fine with me.
9. Better animations when cards are gained/bought/played/...
I think this would be interesting, but I would not make it the highest priority.
10. Better visualization of split piles, Archive/Crypt contents, Prince targets, ...
I think this would be a good feature.
10. Option to hide the log
I think this would be a good feature.
11. Android app (or just improved compatibility?)
I don't own an android phone.
12. iPhone app (or just improved compatibility?)
Yes, I would enjoy this.
13. Downloadable game logs
No, don't really care.
14. Improved moderation (dealing with chat abuse, slowplayers, ...)
No, since, I don't really play multiplayer that often.
15. Tutorial on how to play Dominion
No, since I already know how to play or can google the answer, if I have a specific question about a card or interaction.
16. Tutorial on how to play dominion online.
No, since I already am familiar wit the process.
Username is SOB
1. An offline client, allowing you to play campaigns against bots
Yes, that would interest me a lot. I really enjoyed the old campaign.
2. A bot with a setting for different play styles
Yes, I think this would be very beneficial. I play against bots most of the time and this would engage me more.
3. A strong bot.
Yes, for similar reasons, as above.
4. Options for timed games
N/A, not on my personal list of priorities.
5. Options for undo settings
No, don't really care here.
6. Online mini-tournaments; the option to easily create one for you & your friends.
No, I mostly again play against bots.
7. Option to invite specific players to your table
No, I mostly again play against bots.
8. More translations (to what language?)
No, English is fine with me.
9. Better animations when cards are gained/bought/played/...
I think this would be interesting, but I would not make it the highest priority.
10. Better visualization of split piles, Archive/Crypt contents, Prince targets, ...
I think this would be a good feature.
10. Option to hide the log
I think this would be a good feature.
11. Android app (or just improved compatibility?)
I don't own an android phone.
12. iPhone app (or just improved compatibility?)
Yes, I would enjoy this.
13. Downloadable game logs
No, don't really care.
14. Improved moderation (dealing with chat abuse, slowplayers, ...)
No, since, I don't really play multiplayer that often.
15. Tutorial on how to play Dominion
No, since I already know how to play or can google the answer, if I have a specific question about a card or interaction.
16. Tutorial on how to play dominion online.
No, since I already am familiar wit the process.
Username is SOB