Hi stants and thank you for your interest in TAB IF Creator.
Firstly, there is no conversion program to make CAT adventures run in TAB. So you were right when you said they would have to be recoded by hand; but this is not as difficult as you might first think because of the great similarities between the programs and the "condition/action" language used. The same thing applies to those old Quill/PAW text adventures. It is possible and not too difficult to rewrite one of those games in TAB too if you have the "unpawed" or "unquilled" files (because TAB is a sort of replicant and based upon those older retro systems - but more powerful) Copy/Pasting the text helps speed the rewriting process.
I would like to see the number of TAB users grow and for there to be more games accessible as well. I really think some good and interesting games can be made with the program. To this end I posted info on several forums and the IFWiki and some other places including twitter and also posted some youtube clips.
I will continue to support anyone who needs help in writing a TAB game.
The limits you asked about are currently:
Locations: 500
Objects: 200 (will increase to 500 soon)
Characters: 100
I am glad you like using the TAB and let me assure you it is perfectly usable to write/build a game. I know there are a couple of authors currently making games with it and would totally agree that if you're not using ADRIFT, TADS or INFORM then the TAB is an alternative creator to consider.
Regards,
catventure (Phil)