Where to begin? First off let me say thank you because the old iJoomla team would never have asked this question and be damned if you ever said something negative about their precious extensions. They was arrogant and way to self-riotous to even consider what they did needed help. So for that I am very thankful you guys have it now.
I suppose the biggest pain point is how setting up the meta tags works. For one thing it would be very helpful if it was able to take the page content to populate the description meta tag. Even if it just grabbed some content from the first paragraph. It is a pain as it is because I have to have excerpts from the page in order to populate this data. Given it is really the only thing worth doing anymore for SEO, not having this ability is not promoting the value of it. I wont even go into how out of date this extension is for how SEO works today. While it worked OK back when it was created it really, really misses the boat when it comes to being a valuable SEO tool today. Like everything else the iJoomla team did, they never revisited their extensions and took a deep dive into the functionality. All they did was smash more features together to make it look like a value. I mean really I could set here for the next hour and tell you all thats wrong with it. Another issue that cuts across everything they created is the pitiful tutorials. They were basically lame to begin with but over the years, one updated mashed into another and now many of them are not even recognizable, let alone helpful based on current versions. Want a sample of how useless they are just take a look and dont leave out iGuru tutorials because I think of all of them those are probably the most worthless! While I am glad Joomla Art owns iJoomla now, I dont think you did your homework and looked very close at what they built. Otherwise you would not have to ask me what needs to be improved and I am honestly not sure this was such a wise purchase given the state of most of their extensions. Hopefully you got a good deal but please don’t think you can do as they did and set it and forget it, because much of what they offered was lame, overpriced and had very limp support at best. However since I am moving on and going to be using a modern solution moving forward I already uninstalled this so beyond what I just said I would have to think to much about it to give you anything worth your time. I am sure you can glean a lot just reading back through their old support forum, I am sure there is plenty of evidence there at just how sad a state they was in.