What you mean?
I should need to do reverse engineering on IVF's .asi, lol.
I was too lazy to respond...
Basically, when a mod of this type has to be done, it is necessary to "open" the .exe, try to understand and find where your goal is located (among thousands and thousands of lines of code, mostly with no clues what it really does), so, edit it.
In the case of doing reverse engineering in a mod .asi, would be basically the same thing (asi = dll), but now empty of clues, no tips (because it will be done from the beginning, from scratch, different from the gta_sa.exe that already has interesting information found by the community, which facilitates (the database (IDB))), and, as in a .exe, each version needs to be supported (since each version can have different addresses, so have to adapt for all exe/asi/dll/etc versions). This is totally out of the question. What should be done is the author of such asi mod do this, rather than a secondary mod hack it.