In vanilla game, when you copy from assembler to a requester chest, the request is set so that it would request items for 30 seconds of continuous crafting.

Could you add controls that would do just that? A toggle that switches between "read missing items", "read recipe requirements" and possibly also "read recipe products". Also please provide a signal "T" that returns the recipe's crafting time in miliseconds and "S" for assembler's speed.

As a side note, it could also be nice if you could show the area from which the tower detects things, in a same way that power poles show

This mod - the way to connect circuit wire to assemblers when you will have you normal logistic bots in the next millenia. Mod send circuit signal what resources assemblers exactly need
with no bothering about full ones. Just put resources from the circuit on the belt with no buffer chest. Towers can see many assemblers in area with different recipes, speed and crafting time. Yes i am thinking about how to show that area. P.S. Please not place overlapping towers or assemblers that can bee seen by more than one tower.