Yeah, there is an event limit. I've reached it in an SP pack before (too many enemies, too big level), had to split the level in two just to get it working. I highly doubt you would be able to put in 1000 warps, just a friendly warning

Apart from that, if you put in too many weapon crates and there are too many spawned weapons lying around eventss will start to dissapear all over the place. It's an evil lag preventer that has basically no use today because of the crazy 1GHz (even 3GHz when I'm typing this, would be funny to look back and laugh at the slow 3GHz processor in a few years time) processors available today.

Now, from saying all that, TSF has had this limit increased by a LOT. If tilesets are 4 times the size in TSF you can ASSUME that there is 4 times the amount of events. Now ASSUMING (not sure AT ALL don't quote me on that) the event limit in normal JJ2 is 256, the limit in TSF would be 1024, which would possibly leave you to make 1000 warps, with that you onkly have 24 events for other stuff, too low for all the extra events...