Tablet space for apps from its own internal USB storage I have a Tecno tablet with:
 1 gb RAM/engine
 1 gb Internal Storage/apps installing only. 
 16 gb "USB Storage" internally built (just named like that but it's not external),media/ files 

I do NOT have, NOR want to use an SD/microSD/memory card. 

How can I merge or add up from that USB Storage
 Increase apps installed (the Internal Storage gets full fast;it is the Default Write Disk) 
&amp; any other tweaks to do, PC software, apps, wielding???

I have:- WiFi, this rooted tablet, rooted Android phone, USB cables, Windows laptop, NO SD card.

 HOW please?
Firstly, I do not think that you can install more RAM on most Android devices as they have fixed amounts of RAM. I would suggest that you minimize background processes in order to free up more RAM.

Secondly, I also do not think that you can install more Internal Storage to an Android device, again because the amount is fixed. The only way is to add an SD Card/MicroSD Card which you do not want.

If you install apps to USB Storage, don't you have to constantly keep it plugged in in order for them to run?