About ACL:
There are indeed some topics describing how to alter it, but this will lead to many adjustments. It has to be done but perhaps for later. At
docs.joomla.org/Developing_a_Model-View-...onent/2.5/Adding_ACL there are some steps descibing how to (backend). Resulting in a different code for the toolbars, models, controllers, helper, tables.
That 's the backend, but frontend has to be altered too.
The gids can be altered back to aid's (more options).
the gid is at this moment looking for 3 options and showing groups. with aid it's more and is looking for the viewlevel. Leading to changing a lot of pages.( aid = AuthorizedViewLevels)
that said: we can also remove the group view of eventlist and use the internal ones. And that will also lead to adjustments.
I'm saying perhaps because there are other ways that can lead to rome.
Also, the whole thing has to be tested and make sure it works.
Eventlist v1.02 (clean package):
It's good to put the clean package at the website a a start, without any hacks etc. When uploading changes we can see what has been changed or altered.
Other:
There are a lot of things deprecated or outdated so there is much to be done. Also the code has to be like the standards of Joomla:
developer.joomla.org/coding-standards.html
But as basis we can have code of the eventlist v1.1+eventlist v1.02 and then update/change stuff.
//edit
IT seems that the code in the frontend (in J2.5, com_content) is way different then it is at this moment so the whole thing has to change. Model+submodels. The access thing is also defined in another way. But for now it's probably alright to use the aid thing.
//edit2
why so late? Perhaps there should be also a (beta) version with the hacks included which were discussed in the posts of this (or earlier) forums.
There are indeed versions around with integrated stuff and perhaps people are willing to share their info. Actually i'm also having a version with stuff of v1.1

, but it can be that there is some stuff missing or that things have to be alterd in another way. Also the fieldnames, internalcode has to be cleaned. To speed up things i'm willing to post the changes and merge it in the clean version. This will be posted this week
The version includes: Ical, Calendar, excluded category's, attachments, recurrence, updated gmap code, new imagepack, changed category image upload (backend), altered settings view, waitinglist, changed css (the frontend does not look the way you used to know)
But be aware it's a test version and you can't update from Eventlist v1.02 as there are changed/added fieldnames. And something you have to keep in mind is that the code can be changed.