Scite → Options → Open User Options File (SciteUser.properties):

### Maximize window on startup:
position.width=-1
position.height=-1

### Show linenumbers:
line.margin.visible=1
line.margin.width=4
margin.width=16

### Use multiple buffers: (multiline only works with Windows)
check.if.already.open=1
buffers=30
tabbar.multiline=1
tabbar.visible=1
tabbar.hide.one=1

### Don't waste screenspace on indentation:
tabsize=4
indent.size=4
use.tabs=1
use.tabs.*.tpl=0

### Files changed outside Scite are automatically reloaded, if focus comes back to Scite:
load.on.activate=1
reload.preserves.undo=1

### Following filetypes should appear in the "All Source Files" filter, which is the default
### filter when opening files from inside Scite
source.files=*.log;*.tpl;*.asm;*.c;*.cc;*.cpp;*.cxx;*.cs;*.h;*.hh;*.hxx;*.hpp;*.idl;*.odl;*.rc;*.rc2;*.dlg;*.def;*.vb;*.vbs;*.bas;*.frm;*.cls;*.ctl;*.java;*.js;*.py;*.pl;*.rb;*.cgi;*.lua;*.conf;make*;*.mak;*.properties;*.html;*.xml;*.iface;*.bat;*.e;*.php;*.css;*.js